diff --git a/components/calendar/__tests__/calendar-plugin-surfaces.test.tsx b/components/calendar/__tests__/calendar-plugin-surfaces.test.tsx
index 9c44317d9..b1d0063c1 100644
--- a/components/calendar/__tests__/calendar-plugin-surfaces.test.tsx
+++ b/components/calendar/__tests__/calendar-plugin-surfaces.test.tsx
@@ -194,18 +194,27 @@ describe('calendar-day-header and mini-calendar-marks', () => {
     expect(headerOf('2026-09-09').querySelector('[data-plugin-surface="calendar-day-header"]')).toHaveTextContent('Feast day');
   });
 
-  it('shows the label in the month cell header on desktop only', () => {
-    act(() => setDayLabels('hol', 'Holidays', [{ date: '2026-09-09', text: 'Feast day' }]));
+  it('shows the label in the month cell header, as a dot on phones', () => {
+    act(() => setDayLabels('hol', 'Holidays', [
+      { date: '2026-09-09', text: 'Feast day' },
+      { date: '2026-09-10', dot: true, title: 'Dot only' },
+    ]));
     const month = { ...week, windowKey: 'month:2026-09-09', rangeStart: new Date(2026, 7, 31), rangeEnd: new Date(2026, 9, 4) };
     const { unmount } = render(<CalendarMonthView {...month} />);
 
     const labels = document.querySelectorAll('[data-plugin-surface="calendar-day-header"]');
     expect(labels).toHaveLength(1);
+    expect(labels[0]).toHaveTextContent('Feast day');
     expect(labels[0].closest('[role="gridcell"]')?.getAttribute('aria-label')).toMatch(/9/);
     unmount();
 
     render(<CalendarMonthView {...month} isMobile />);
-    expect(document.querySelector('[data-plugin-surface="calendar-day-header"]')).toBeNull();
+    const dots = [...document.querySelectorAll<HTMLElement>('[data-plugin-surface="calendar-day-header"]')];
+    expect(dots).toHaveLength(2);
+    for (const dot of dots) expect(dot).toHaveAttribute('data-compact');
+    expect(dots[0].closest('[role="gridcell"]')?.getAttribute('aria-label')).toMatch(/9/);
+    expect(dots[0].title).toBe('Feast day (Holidays)');
+    expect(dots[1].title).toBe('Dot only (Holidays)');
   });
 
   it('marks days with a dot in the small month calendar', () => {
@@ -224,4 +233,22 @@ describe('calendar-day-header and mini-calendar-marks', () => {
     expect(dots[0].closest('button')).toHaveTextContent('9');
     expect(dots[0].closest('button')).toHaveTextContent('A feast');
   });
+
+  it('keeps the dot visible on today, whose filled circle has white text', () => {
+    vi.useFakeTimers({ toFake: ['Date'] });
+    vi.setSystemTime(new Date(2026, 8, 9, 12));
+    try {
+      act(() => setDayLabels('hol', 'Holidays', [{ date: '2026-09-09', dot: true, title: 'A feast' }]));
+      render(
+        <MiniCalendar selectedDate={new Date(2026, 8, 1)} displayMonth={new Date(2026, 8, 1)} onSelectDate={vi.fn()} onChangeMonth={vi.fn()} />,
+      );
+      const dot = document.querySelector<HTMLElement>('[data-plugin-surface="mini-calendar-marks"]')!;
+      expect(dot.closest('button')).toHaveAttribute('aria-current', 'date');
+      // Its own colour, not the button's text colour, which is white on today.
+      expect(dot.className).not.toMatch(/bg-current/);
+      expect(dot.className).toMatch(/ring-background/);
+    } finally {
+      vi.useRealTimers();
+    }
+  });
 });
diff --git a/components/calendar/calendar-month-view.tsx b/components/calendar/calendar-month-view.tsx
index 1164876b5..cd413898a 100644
--- a/components/calendar/calendar-month-view.tsx
+++ b/components/calendar/calendar-month-view.tsx
@@ -380,7 +380,8 @@ export function CalendarMonthView({
                     >
                       {formatDayNumber(day)}
                     </button>
-                    {!isMobile && <PluginDayLabel surface="calendar-day-header" date={key} className="min-w-0 flex-1" />}
+                    {/* Phones have no room for the text: a dot stands in for it. */}
+                    <PluginDayLabel surface="calendar-day-header" date={key} compact={isMobile} className={isMobile ? undefined : "min-w-0 flex-1"} />
                   </div>
                   {isMobile && !showChips ? (
                     <div className="flex items-center justify-center gap-0.5 flex-wrap">
diff --git a/components/calendar/plugin-day-label.tsx b/components/calendar/plugin-day-label.tsx
index 63ff9aa0f..5fc22e768 100644
--- a/components/calendar/plugin-day-label.tsx
+++ b/components/calendar/plugin-day-label.tsx
@@ -27,10 +27,16 @@ interface PluginDayLabelProps {
   /** YYYY-MM-DD */
   date: string;
   className?: string;
+  /**
+   * calendar-day-header only: no room for text (the phone month view), so a
+   * dot stands for the day's labels; their text is its tooltip and is read
+   * out by screen readers.
+   */
+  compact?: boolean;
 }
 
 /** What plugins put on a calendar day. Renders nothing without labels. */
-export function PluginDayLabel({ surface, date, className }: PluginDayLabelProps) {
+export function PluginDayLabel({ surface, date, className, compact }: PluginDayLabelProps) {
   const labels = useDayLabels(date);
 
   if (surface === "mini-calendar-marks") {
@@ -42,13 +48,29 @@ export function PluginDayLabel({ surface, date, className }: PluginDayLabelProps
           aria-hidden="true"
           data-plugin-surface="mini-calendar-marks"
           title={tooltip(marks)}
-          className={cn("pointer-events-none absolute top-0.5 end-0.5 h-1 w-1 rounded-full bg-current opacity-70", className)}
+          className={cn("pointer-events-none absolute top-0 end-0 h-1.5 w-1.5 rounded-full bg-muted-foreground ring-1 ring-background", className)}
         />
         <span className="sr-only">{marks.map((l) => l.title ?? l.text ?? l.pluginName).join(", ")}</span>
       </>
     );
   }
 
+  if (compact) {
+    const shown = labels.filter((l) => l.text || l.dot);
+    if (shown.length === 0) return null;
+    return (
+      <span
+        data-plugin-surface="calendar-day-header"
+        data-compact=""
+        title={tooltip(shown)}
+        className={cn("inline-flex flex-shrink-0", className)}
+      >
+        <span aria-hidden="true" className="block h-1.5 w-1.5 rounded-full bg-muted-foreground" />
+        <span className="sr-only">{shown.map((l) => l.text ?? l.title ?? l.pluginName).join(", ")}</span>
+      </span>
+    );
+  }
+
   const withText = labels.filter((l) => l.text);
   if (withText.length === 0) return null;
   return (
diff --git a/lib/plugin-slot-catalog.ts b/lib/plugin-slot-catalog.ts
index c633f629b..768e2bb02 100644
--- a/lib/plugin-slot-catalog.ts
+++ b/lib/plugin-slot-catalog.ts
@@ -89,7 +89,7 @@ export const SLOT_CATALOG = {
   'calendar-event-actions': S('calendar', 'frame', ['ui:calendar-action'], { eventData: 'calendar:read', setVirtualLocation: null }, 'buttons in the event form', true),
   'calendar-event-detail': S('calendar', 'frame', ['ui:calendar-action'], { event: 'calendar:read' }, 'a section in an event\'s details'),
   'calendar-event-form': S('calendar', 'frame', ['ui:calendar-action'], { event: 'calendar:read' }, 'a section in the form for a new or edited event'),
-  'calendar-day-header': S('calendar', 'data', ['ui:calendar-action'], { date: null }, 'a short label under a day\'s name in the day and week views (api.ui.setDayLabels)'),
+  'calendar-day-header': S('calendar', 'data', ['ui:calendar-action'], { date: null }, 'a short label under a day\'s name in the day, week and month views; a dot in the phone month view (api.ui.setDayLabels)'),
   'mini-calendar-marks': S('calendar', 'data', ['ui:calendar-action'], { date: null }, 'dots on days in the small month calendar (api.ui.setDayLabels)'),
 
   // ─── Contacts ──────────────────────────────────────────────