So this event went on from what? late on the 7th. till early on the 13th.?
that's 6 days.
If you start racing a half hour later than normal and end a half hour earlier...
that's 1 hour a day less racing.
multiply that by 6 days, and that's 6 hours less opportunity to race thru the whole event.
never mind the spectators,
The racers are the ones who paid the money to run a full event,
If anyone, they are the ones who got short changed.
Just my opinion, and your math may vary.