A member has the right to change his vote up to the time the vote is finally announced. After that, he can make the change only by permission of the assembly, which may be given by general consent; that is, by no member's objecting when the chair inquires if any one objects.
You can add your FREE SPIRIT number to a reservation up to 30 days after travel to receive your mileage credit. Just go into your profile at spirit.com and request mileage credit within 30 days of your flight. Just a heads up, miles can only be awarded to customers actually traveling on the flight.
Be sure to confirm all this with the hotel manager. Ask them for that number of rooms and do your RSVP. When you receive them back call the hotel and let them know. A-Talk to the group rate coordinator and ask them to hold a block of rooms with a 2 to 3 month window for people to call back and confirm a reservation.