Usually takes us a few days to settle into Florida time.
I assume your brother has sorted their wedding license out from UK, or is that something they will be doing on day 1?
Would say that you will still be tired early on the 2nd day, so wouldn't plan on having the wedding meal too late in the evening - would suggest late afternoon really.
Marriotts Cypress Harbour May/June 2002
Vacation Villas at Fantasyworld May/June 2005
Cypress Pointe Grand Villas August 2008
Cypress Pointe Grand Villas Aug/Sept 2010
Cypress Pointe Resort July/Aug 2011
Four Points on a Fat Boy August 2012