From mid-May to mid-June:
4 performances/class events - two at 9:00 am, two at 4:00 pm.
2 after-hours events at 6:00 pm (childcare provided)
2 Saturday events
The events during school hours are the ones I feel obligated to go to so I take off time from work (using annual leave) to attend those. The after hours and weekend things are totally optional, of course -- school auction, field day/end of year picnic, PTA meeting, etc. I don't always go to these but this year I have for some reason which is why I'm feeling about now that I spend as much time at school as work
And I only have one kid! More kids = more performances/events to attend during school hours.