Add AI parent meetings after a class last lesson.

Class teachers rarely keep the homeroom; invited parents walk onto the map, opinions nudge, then parents leave OffCampus. No player schedule API.

src/HSchool.Content/EventDefValidator.cs

@@ -15,6 +15,7 @@ internal static class EventDefValidator
         EventTriggers.LessonStart,
         EventTriggers.GenerationFailed,
         EventTriggers.DirectorSummon,
+        EventTriggers.ParentMeeting,
     };
 
     private static readonly HashSet<string> Actions = new(StringComparer.Ordinal)

src/HSchool.Content/EventDefs.cs

@@ -13,6 +13,7 @@ public static class EventTriggers
     public const string LessonStart = "lessonStart";
     public const string GenerationFailed = "generationFailed";
     public const string DirectorSummon = "directorSummon";
+    public const string ParentMeeting = "parentMeeting";
 }
 
 public static class EventActions

src/HSchool.Content/PeopleDefValidator.cs

@@ -684,6 +684,24 @@ internal static class PeopleDefValidator
                 $"BehaviorDef '{behavior.DefName}' directorHearingMinutes must be positive.");
         }
 
+        if (behavior.ParentMeetingChance is < 0f or > 1f)
+        {
+            throw new ContentLoadException(
+                $"BehaviorDef '{behavior.DefName}' parentMeetingChance must be 0–1.");
+        }
+
+        if (behavior.ParentMeetingAttendanceFraction is < 0f or > 1f)
+        {
+            throw new ContentLoadException(
+                $"BehaviorDef '{behavior.DefName}' parentMeetingAttendanceFraction must be 0–1.");
+        }
+
+        if (behavior.ParentMeetingMinutes <= 0f)
+        {
+            throw new ContentLoadException(
+                $"BehaviorDef '{behavior.DefName}' parentMeetingMinutes must be positive.");
+        }
+
         if (behavior.LessonMarkMax < 0)
         {
             throw new ContentLoadException($"BehaviorDef '{behavior.DefName}' lessonMarkMax cannot be negative.");

src/HSchool.Content/PeopleDefs.cs

@@ -595,6 +595,25 @@ public sealed class BehaviorDef : Def
     /// <summary>Opinion of the Principal after a hearing. Negative — the visit is not praise.</summary>
     public int DirectorHearingOpinionShift { get; init; } = -12;
 
+    /// <summary>
+    /// Chance a class with a class teacher holds a parent meeting after its last lesson.
+    /// Low in vanilla — meetings are rare AI, not a weekly calendar.
+    /// </summary>
+    public float ParentMeetingChance { get; init; } = 0.08f;
+
+    /// <summary>
+    /// Independent chance each class parent is invited when a meeting starts. Not 100% attendance.
+    /// </summary>
+    public float ParentMeetingAttendanceFraction { get; init; } = 0.4f;
+
+    /// <summary>Game minutes the class teacher keeps the homeroom for the meeting.</summary>
+    public float ParentMeetingMinutes { get; init; } = 20f;
+
+    /// <summary>
+    /// Opinion shift both ways between each attending parent and the class teacher. Small and positive.
+    /// </summary>
+    public int ParentMeetingOpinionShift { get; init; } = 3;
+
     public static IReadOnlyList<string> DefaultOffenseMemoryKinds { get; } =
     [
         "quarrel",