before the wedding dinner/banquet actually start, before or during the makeup at your room, ask room service to send food to your room. Sandwiches etc.
Cos banquet, you got no time to eat.
Some hotels give its as free food, some give $60 room service vouchers.
Oh. My hotel will also pack the banquet food and send it to the room after everything is over. I dunno if all hotels do that, so ask for that.