Let admins edit event date and time

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

templates/event.html

@@ -93,6 +93,21 @@
 {{end}}
 
 {{if .IsAdmin}}
+<div class="section-label" style="margin-top:40px">Admin: Date &amp; time</div>
+<div class="claim-form-wrapper">
+  <form method="POST" action="/e/{{.Event.Slug}}/admin/{{.Event.AdminToken}}/datetime">
+    <div class="form-row">
+      <label>Date</label>
+      <input type="text" name="date" value="{{.Event.Date}}" placeholder="e.g. Saturday, June 14">
+    </div>
+    <div class="form-row">
+      <label>Time</label>
+      <input type="text" name="time" value="{{.Event.Time}}" placeholder="e.g. 2:00 PM">
+    </div>
+    <button class="btn-submit" type="submit">Save date &amp; time</button>
+  </form>
+</div>
+
 <div class="section-label" style="margin-top:40px">Admin: Location</div>
 <div class="claim-form-wrapper">
   <form method="POST" action="/e/{{.Event.Slug}}/admin/{{.Event.AdminToken}}/location">