Add Max Volunteer field to form.

Added max volunteer to scheduler.event so it can be varied from booking
to booking (a big win for me in registration) since different
volunteers may be needed at different times of day.

Added it to the view of events table, and to the event scheduling form.

Also fixed a big in the day entry.
Intial layout for schedule build

- I need to make a booking list to test volunteer scheduling
- So I figured I may as well build out for the show personal schedule.
- I suspect that we’ll want to muck with the display, either this
location needs to be an expandable area, or I need to move the location
of the schedule section… but it’s modular enough to move around.