diff --git a/src/frontend/src/components/calendar/Calendar.tsx b/src/frontend/src/components/calendar/Calendar.tsx
index 8b80347fce..dcddcdcfd1 100644
--- a/src/frontend/src/components/calendar/Calendar.tsx
+++ b/src/frontend/src/components/calendar/Calendar.tsx
@@ -1,4 +1,8 @@
-import type { CalendarOptions, DatesSetArg } from '@fullcalendar/core';
+import type {
+  CalendarOptions,
+  DatesSetArg,
+  EventContentArg
+} from '@fullcalendar/core';
 import allLocales from '@fullcalendar/core/locales-all';
 import dayGridPlugin from '@fullcalendar/daygrid';
 import interactionPlugin from '@fullcalendar/interaction';
@@ -15,6 +19,7 @@ import {
   Box,
   Button,
   Group,
+  HoverCard,
   Indicator,
   LoadingOverlay,
   Popover,
@@ -29,7 +34,13 @@ import {
   IconDownload,
   IconFilter
 } from '@tabler/icons-react';
-import { useCallback, useEffect, useMemo, useState } from 'react';
+import {
+  type ReactNode,
+  useCallback,
+  useEffect,
+  useMemo,
+  useState
+} from 'react';
 import { useShallow } from 'zustand/react/shallow';
 import {
   defaultLocale,
@@ -44,6 +55,7 @@ export interface InvenTreeCalendarProps extends CalendarOptions {
   enableDownload?: boolean;
   enableFilters?: boolean;
   enableSearch?: boolean;
+  eventTooltipContent?: (event: EventContentArg) => ReactNode;
   filters?: TableFilter[];
   isLoading?: boolean;
   state: CalendarState;
@@ -53,6 +65,7 @@ export default function Calendar({
   enableDownload,
   enableFilters = false,
   enableSearch,
+  eventTooltipContent,
   isLoading,
   filters,
   state,
@@ -112,6 +125,36 @@ export default function Calendar({
     [calendarProps.datesSet, state.ref, state.setMonthName]
   );
 
+  const wrappedEventContent = useCallback(
+    (arg: EventContentArg) => {
+      const inner =
+        typeof calendarProps.eventContent === 'function'
+          ? calendarProps.eventContent(arg, null)
+          : (calendarProps.eventContent ?? null);
+
+      if (!eventTooltipContent) return inner;
+
+      const tooltip = eventTooltipContent(arg);
+
+      if (!tooltip) return inner;
+
+      return (
+        <HoverCard
+          openDelay={300}
+          closeDelay={100}
+          shadow='md'
+          position='top-start'
+        >
+          <HoverCard.Target>
+            <div style={{ width: '100%', overflow: 'hidden' }}>{inner}</div>
+          </HoverCard.Target>
+          <HoverCard.Dropdown>{tooltip}</HoverCard.Dropdown>
+        </HoverCard>
+      );
+    },
+    [calendarProps.eventContent, eventTooltipContent]
+  );
+
   return (
     <>
       {state.exportModal.modal}
@@ -217,6 +260,7 @@ export default function Calendar({
             footerToolbar={false}
             {...calendarProps}
             datesSet={datesSet}
+            eventContent={wrappedEventContent}
           />
         </Box>
       </Stack>
diff --git a/src/frontend/src/components/calendar/OrderCalendar.tsx b/src/frontend/src/components/calendar/OrderCalendar.tsx
index 9c3523653e..95fd76abe3 100644
--- a/src/frontend/src/components/calendar/OrderCalendar.tsx
+++ b/src/frontend/src/components/calendar/OrderCalendar.tsx
@@ -46,12 +46,14 @@ export default function OrderCalendar({
   model,
   role,
   params,
-  filters
+  filters,
+  tooltip
 }: {
   model: ModelType;
   role: UserRoles;
   params: Record<string, any>;
   filters?: TableFilter[];
+  tooltip?: (event: EventContentArg) => React.ReactNode;
 }) {
   const navigate = useNavigate();
   const user = useUserState();
@@ -106,6 +108,7 @@ export default function OrderCalendar({
         const end: string = order.target_date || start;
 
         return {
+          order: order,
           id: order.pk,
           title: order.reference,
           description: order.description,
@@ -209,6 +212,7 @@ export default function OrderCalendar({
       state={calendarState}
       filters={calendarFilters}
       editable={true}
+      eventTooltipContent={tooltip}
       eventContent={renderOrder}
       eventClick={onClickOrder}
       eventChange={onEditOrder}
diff --git a/src/frontend/src/components/calendar/OrderCalendarToolTip.tsx b/src/frontend/src/components/calendar/OrderCalendarToolTip.tsx
new file mode 100644
index 0000000000..dba5259358
--- /dev/null
+++ b/src/frontend/src/components/calendar/OrderCalendarToolTip.tsx
@@ -0,0 +1,61 @@
+import type { EventContentArg } from '@fullcalendar/core';
+import type { ModelType } from '@lib/enums/ModelType';
+import { resolveItem } from '@lib/functions/Conversion';
+import { t } from '@lingui/core/macro';
+import { Badge, Divider, Group, Stack, Text } from '@mantine/core';
+import { formatDate } from '../../defaults/formatters';
+import { RenderInstance } from '../render/Instance';
+import { RenderOwner } from '../render/User';
+
+export default function OrderCalendarToolTip({
+  event,
+  instanceLookup,
+  modelType
+}: {
+  event: EventContentArg;
+  instanceLookup: string;
+  modelType: ModelType;
+}) {
+  // Extract the order instance from the event
+  const order = event?.event?._def?.extendedProps?.order;
+
+  const instance = resolveItem(order, instanceLookup);
+
+  if (!order) return null;
+
+  return (
+    <Stack gap='xs'>
+      <RenderInstance model={modelType} instance={instance} />
+      <Divider />
+      <Group gap='xs'>
+        <Text size='sm' fw='bold'>
+          {order.reference}
+        </Text>
+        <Text size='xs'>{order.description || order.title}</Text>
+      </Group>
+      {order.start_date && (
+        <Group gap='xs'>
+          <Text size='sm' fw='bold'>{t`Start Date`}</Text>
+          <Text size='xs'>{formatDate(order.start_date)}</Text>
+        </Group>
+      )}
+      {order.target_date && (
+        <Group gap='xs'>
+          <Text size='sm' fw='bold'>{t`Target Date`}</Text>
+          <Text size='xs'>{formatDate(order.target_date)}</Text>
+          {order.overdue && (
+            <Badge size='sm' color='red'>
+              {t`Overdue`}
+            </Badge>
+          )}
+        </Group>
+      )}
+      {order.responsible && (
+        <Group gap='xs'>
+          <Text size='sm' fw='bold'>{t`Responsible`}</Text>
+          <RenderOwner instance={order.responsible_detail} />
+        </Group>
+      )}
+    </Stack>
+  );
+}
diff --git a/src/frontend/src/components/render/Company.tsx b/src/frontend/src/components/render/Company.tsx
index e8050d5f12..09aeee04cc 100644
--- a/src/frontend/src/components/render/Company.tsx
+++ b/src/frontend/src/components/render/Company.tsx
@@ -50,11 +50,11 @@ export function RenderCompany(
   return (
     <RenderInlineModel
       {...props}
-      image={instance.thumbnail || instance.image}
-      primary={instance.name}
-      suffix={instance.description}
+      image={instance?.thumbnail || instance?.image}
+      primary={instance?.name}
+      suffix={instance?.description}
       url={
-        props.link ? getDetailUrl(ModelType.company, instance.pk) : undefined
+        props.link ? getDetailUrl(ModelType.company, instance?.pk) : undefined
       }
     />
   );
diff --git a/src/frontend/src/pages/build/BuildIndex.tsx b/src/frontend/src/pages/build/BuildIndex.tsx
index 287b1d9cc4..f52441923d 100644
--- a/src/frontend/src/pages/build/BuildIndex.tsx
+++ b/src/frontend/src/pages/build/BuildIndex.tsx
@@ -6,14 +6,16 @@ import {
   IconTable,
   IconTools
 } from '@tabler/icons-react';
-import { useMemo } from 'react';
+import { useCallback, useMemo } from 'react';
 
+import type { EventContentArg } from '@fullcalendar/core';
 import { ModelType, PluginPanelKey } from '@lib/enums/ModelType';
 import { UserRoles } from '@lib/enums/Roles';
 import type { TableFilter } from '@lib/types/Filters';
 import type { PanelType } from '@lib/types/Panel';
 import { useLocalStorage } from '@mantine/hooks';
 import OrderCalendar from '../../components/calendar/OrderCalendar';
+import OrderCalendarToolTip from '../../components/calendar/OrderCalendarToolTip';
 import PermissionDenied from '../../components/errors/PermissionDenied';
 import { PageDetail } from '../../components/nav/PageDetail';
 import { PanelGroup } from '../../components/panels/PanelGroup';
@@ -34,12 +36,21 @@ function BuildOrderCalendar() {
     });
   }, [globalSettings]);
 
+  const renderTooltip = useCallback((event: EventContentArg) => {
+    return OrderCalendarToolTip({
+      event: event,
+      modelType: ModelType.part,
+      instanceLookup: 'part_detail'
+    });
+  }, []);
+
   return (
     <OrderCalendar
       model={ModelType.build}
       role={UserRoles.build}
-      params={{ outstanding: true }}
+      params={{ outstanding: true, part_detail: true }}
       filters={calendarFilters}
+      tooltip={renderTooltip}
     />
   );
 }
diff --git a/src/frontend/src/pages/purchasing/PurchasingIndex.tsx b/src/frontend/src/pages/purchasing/PurchasingIndex.tsx
index 3087c9b530..bdaa271c0e 100644
--- a/src/frontend/src/pages/purchasing/PurchasingIndex.tsx
+++ b/src/frontend/src/pages/purchasing/PurchasingIndex.tsx
@@ -10,13 +10,15 @@ import {
   IconShoppingCart,
   IconTable
 } from '@tabler/icons-react';
-import { useMemo } from 'react';
+import { useCallback, useMemo } from 'react';
 
+import type { EventContentArg } from '@fullcalendar/core';
 import { ModelType, PluginPanelKey } from '@lib/enums/ModelType';
 import { UserRoles } from '@lib/enums/Roles';
 import type { TableFilter } from '@lib/index';
 import { useLocalStorage } from '@mantine/hooks';
 import OrderCalendar from '../../components/calendar/OrderCalendar';
+import OrderCalendarToolTip from '../../components/calendar/OrderCalendarToolTip';
 import PermissionDenied from '../../components/errors/PermissionDenied';
 import { PageDetail } from '../../components/nav/PageDetail';
 import { PanelGroup } from '../../components/panels/PanelGroup';
@@ -37,12 +39,21 @@ function PurchaseOrderCalendar() {
     return PurchaseOrderFilters({ includeDateFilters: false });
   }, []);
 
+  const renderTooltip = useCallback((event: EventContentArg) => {
+    return OrderCalendarToolTip({
+      event: event,
+      modelType: ModelType.company,
+      instanceLookup: 'supplier_detail'
+    });
+  }, []);
+
   return (
     <OrderCalendar
       model={ModelType.purchaseorder}
       role={UserRoles.purchase_order}
-      params={{ outstanding: true }}
+      params={{ outstanding: true, supplier_detail: true }}
       filters={calendarFilters}
+      tooltip={renderTooltip}
     />
   );
 }
diff --git a/src/frontend/src/pages/sales/SalesIndex.tsx b/src/frontend/src/pages/sales/SalesIndex.tsx
index a36fde83da..0f1c0879b0 100644
--- a/src/frontend/src/pages/sales/SalesIndex.tsx
+++ b/src/frontend/src/pages/sales/SalesIndex.tsx
@@ -9,13 +9,15 @@ import {
   IconTruckDelivery,
   IconTruckReturn
 } from '@tabler/icons-react';
-import { useMemo } from 'react';
+import { useCallback, useMemo } from 'react';
 
+import type { EventContentArg } from '@fullcalendar/core';
 import { ModelType, PluginPanelKey } from '@lib/enums/ModelType';
 import { UserRoles } from '@lib/enums/Roles';
 import type { TableFilter } from '@lib/index';
 import { useLocalStorage } from '@mantine/hooks';
 import OrderCalendar from '../../components/calendar/OrderCalendar';
+import OrderCalendarToolTip from '../../components/calendar/OrderCalendarToolTip';
 import PermissionDenied from '../../components/errors/PermissionDenied';
 import { PageDetail } from '../../components/nav/PageDetail';
 import { PanelGroup } from '../../components/panels/PanelGroup';
@@ -35,12 +37,21 @@ function SalesOrderCalendar() {
     return SalesOrderFilters({ includeDateFilters: false });
   }, []);
 
+  const renderTooltip = useCallback((event: EventContentArg) => {
+    return OrderCalendarToolTip({
+      event: event,
+      modelType: ModelType.company,
+      instanceLookup: 'customer_detail'
+    });
+  }, []);
+
   return (
     <OrderCalendar
       model={ModelType.salesorder}
       role={UserRoles.sales_order}
-      params={{ outstanding: true }}
+      params={{ outstanding: true, customer_detail: true }}
       filters={calendarFilters}
+      tooltip={renderTooltip}
     />
   );
 }
@@ -50,12 +61,21 @@ const ReturnOrderCalendar = () => {
     return SalesOrderFilters({ includeDateFilters: false });
   }, []);
 
+  const renderTooltip = useCallback((event: EventContentArg) => {
+    return OrderCalendarToolTip({
+      event: event,
+      modelType: ModelType.company,
+      instanceLookup: 'customer_detail'
+    });
+  }, []);
+
   return (
     <OrderCalendar
       model={ModelType.returnorder}
       role={UserRoles.return_order}
-      params={{ outstanding: true }}
+      params={{ outstanding: true, customer_detail: true }}
       filters={calendarFilters}
+      tooltip={renderTooltip}
     />
   );
 };
diff --git a/src/frontend/src/tables/InvenTreeTableHeader.tsx b/src/frontend/src/tables/InvenTreeTableHeader.tsx
index 612b6ba06d..2defcb7a22 100644
--- a/src/frontend/src/tables/InvenTreeTableHeader.tsx
+++ b/src/frontend/src/tables/InvenTreeTableHeader.tsx
@@ -276,6 +276,7 @@ export default function InvenTreeTableHeader({
                         <Divider />
                         {tableState.filterSet.activeFilters?.map((filter) => (
                           <FilterPreview
+                            key={filter.name}
                             filter={filter}
                             filters={tableProps.tableFilters}
                           />