The theme nights start closer to 7. Rebeca did reserve 50 seats for us at the Fiesta. We were right up front and it was super fun.
An ipod at the bonfire is a great idea. We didn't do a slideshow at the bonfire, but we did watch a movie on the beach so I would imagine that a slideshow on the beach would be completely feasible.
Each night the staff leaves a daily activity sheet in each room. It has the schedule and even weddings and birthdays for the next day.