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diff --git a/src/eventpane.h b/src/eventpane.h
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+/*
+ * qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
+ * Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#pragma once
+
+#include "caltypes.h"
+
+#include <QStackedWidget>
+
+class QCheckBox;
+class QComboBox;
+class QDateEdit;
+class QDateTimeEdit;
+class QLabel;
+class QLineEdit;
+class QPlainTextEdit;
+class QPushButton;
+class QSpinBox;
+
+/// The calendar window's right-hand pane: a read-only page for the selected
+/// event, and the edit form that replaces it (spec decision 11).
+///
+/// Every value from a file is shown in a Qt::PlainText label: SUMMARY,
+/// DESCRIPTION, LOCATION and attendee names come from strangers once
+/// invitations arrive, which is MessageDetailsDialog's rule.
+class EventPane : public QStackedWidget
+{
+    Q_OBJECT
+
+public:
+    explicit EventPane(QWidget *parent = nullptr);
+
+    void showNothing();
+    void showDetails(const CalEvent &event, const CalCollection &collection,
+                     const Occurrence &occurrence, bool editable);
+
+    /// Opens the form. `collections` are the writable ones, for the Calendar
+    /// combo; `repeatEditable` is false for a single occurrence, which has no
+    /// rule of its own; `collectionEditable` is false for the same reason.
+    void startEdit(const EventEdit &initial, const QList<CalCollection> &collections,
+                   bool repeatEditable, bool collectionEditable,
+                   const QString &reminderText, const QString &attendeesText);
+    void stopEdit();
+
+    bool isEditing() const;
+    bool isDirty() const;
+    EventEdit edit() const;
+
+signals:
+    void editRequested();
+    void deleteRequested();
+    void saveRequested();
+    void cancelRequested();
+
+private:
+    QWidget *buildDetails();
+    QWidget *buildForm();
+    QWidget *buildRepeat();
+    void setRepeat(const RepeatRule &rule);
+    RepeatRule repeat() const;
+    void proposeFromStart();
+    void refreshRepeatVisibility();
+    void refreshAllDay();
+
+    // Details page.
+    QLabel *m_title;
+    QLabel *m_when;
+    QLabel *m_repeatText;
+    QLabel *m_calendar;
+    QLabel *m_location;
+    QLabel *m_notes;
+    QLabel *m_reminder;
+    QLabel *m_people;
+    QLabel *m_notice;
+    QPushButton *m_editButton;
+    QPushButton *m_deleteButton;
+
+    // Form.
+    QLineEdit *m_titleEdit;
+    QComboBox *m_calendarBox;
+    QCheckBox *m_allDay;
+    QDateTimeEdit *m_startEdit;
+    QDateTimeEdit *m_endEdit;
+    QLineEdit *m_locationEdit;
+    QPlainTextEdit *m_notesEdit;
+    QLabel *m_formReminder;
+    QLabel *m_formPeople;
+    QLabel *m_formNotice;
+
+    // Repeat control.
+    QWidget *m_repeatBox;
+    QComboBox *m_freq;          ///< None, Daily, Weekly, Monthly, Yearly, [Custom]
+    QSpinBox *m_interval;
+    QWidget *m_weekdayRow;
+    QList<QCheckBox *> m_weekdays;  ///< Monday first, index = Qt::DayOfWeek - 1
+    QComboBox *m_by;            ///< "on day N" / "on the Nth weekday"
+    QSpinBox *m_monthDay;
+    QComboBox *m_ordinal;       ///< first..fourth, last
+    QComboBox *m_weekday;
+    QComboBox *m_month;
+    QComboBox *m_end;           ///< never, on a date, after N times
+    QDateEdit *m_until;
+    QSpinBox *m_count;
+    QLabel *m_customLabel;
+
+    EventEdit m_initial;
+    RepeatRule m_customRule;    ///< Kept when the rule read was custom.
+    QDateTime m_previousStart;  ///< For keeping the duration as the start moves.
+    bool m_editing = false;
+};