I need some creative ideas.?

My two boys, 2 adn 4 1/2 are going to be the ringbearers in my wedding in July. They are both very attached to me as I am home with them all the time. I dont think I'll have any issues getting them down the aisle, but I'm worried about during the ceremony. My fiance and I don't know many people and there won't be any other kids there except our 12 mth old neice who's our flower girl. We are concerned that our boys will seek our attention while we are exchanging our vows. I had every intention on giving them candy to walk down the aisle so that will keep them still for a few minutes. Has anyone gone through this with small children? Do coloring books, puzzles, and such things keep them still for like an hour and half? There is a quiet room upstairs with windows that they can still see us through but I feel bad about that idea. Like I'm excluding them in some way. After discussion we've all agreed that we want our vows uninterupted and need to figure out how to keep the boys happy also.