I don't know what happened. I don't think I did anything twice, but okay.
Tried again - Kinda weird that sub-events are auto-named Day 2 and Day 3. If they are days, they should be one and two. The overall event includes all days. The sub-events are days one and two, assuming that they are days. You asked me to create two sub-events for one day event. I'll have to edit those fields.