Ring bearer advise... Day of

So excited for my SIL's wedding. I'm the MOH so will be very busy that day. It's next month so I'm sure I'll post a few more times with questions.
My boys are almost 4 and 20 months.
Both stubborn and my 20 month old (if you read the "screaming toddler" post is stubborn). My older DS is pretty good, but a big winer so you never know.
The wedding is at night just around their bedtime. It's also on LI. We are in NJ so will be spending the day at my IL's house. Hoping my LO will nap for a long time and my older one relaxes.
Any advise for the day of to keep them occupied?
Gonna be a loooong day. We are leaving early since I have a hair and make up appt around 11ish.
The girls and moms will be there too so DH and my fil will be with the boys.
We will most likely start pics around 5 I think then the wedding starts at 7:30.
Plan on having them leave after the ceremony since its late.
Babysitter coming at 5 to help
Thinking no mess snacks and lots of toys to bribe to get them to smile for pics and the aisle.
I know they're kids so they can be unpredictable. It is what it is, but some advise would be great.
Thanks

Ring bearer advise... Day of

My son was 2 at my wedding and he was in another wedding around the same time...i brought his portable dvd player, wiht his favorite movies and the charger...for the last hour or so he was in his stroller watching the movie

Message edited 3/4/2013 3:06:27 PM.