Booking closing date must be after late booking fee date.....
I think that standard booking conditions should be auto filled for editting with anything specific to this conference?
Are you happy that late booking fee can be less than early fee?

My alert level is higher than the max delegates - message perfect.
Booking closing date is after the start of the course
Late booking fee date is after the end of the course
My breakout group timing overlaps.- message perfect but session 2 ends before the start!
Late booking fee is less than the early fee
Where are the suplimentary fees - eg Full member (from member category) and then Member of R3 which would attract a lesser fee - in the spec we had the member category and then an additional optional category to correspond to the member category and offering a different fee?

Please come to this event. 

TEST TEST TEST

This is the test event for online bookings