Separate event dipslay from event slot display

Pull out the list of events into its own page sorted by name and show
the event slots in chronological order on the schedule page, with past
slots hidden by default.  This makes the content underneath the schedule
the most immediately useful to have in the moment, while the full list
is kept separately and in a predictable order.

utils/functions.ts

@@ -21,6 +21,12 @@ export function queryToNumber(item?: null | LocationQueryValue | LocationQueryVa
 	return Number.parseInt(item, 10);
 }
 
+export function queryToBoolean(item?: null | LocationQueryValue | LocationQueryValue[]) {
+	if (item === undefined)
+		return false;
+	return true;
+}
+
 export function idMap<T extends { id: Id }>(entities: T[]) {
 	return new Map(entities.map(entity => [entity.id, entity]));
 }