"How about in LA in the spring or SF?"
First, contact the SubCommittee for their Regatta Handbook.
Then find the location which has the following:
Close, substantial parking
Shade (either a covered pavilion, trees, or a tent)
Food nearby (or a vendor on premises)
Enough warm bodies dedicated enough to give all for the cause
Once all that is done, then, and only then, approach the SubCommittee for sponsorship.
Please note that the SubCommittee does not run these events. They only sponsor.
The U.S. of A - Land of the Free BECAUSE of the Brave