I brought my 2y/o to dinsey last year and we had a blast. Generally speaking rides like Peter Pan's Flight, Snow White, Its a small world and Dumbo the Flying elephant where big hits. ALso the meet and greats with the characters is fun for youngins. I also took my little one on Pirates of Caribbean, which i was a little concerned about at first, but he loved it.
Some of the roller coasters have a 40in Height requirement so you can count those out right away. One thing I did, which was a big help and i would strongly recomend, was ask guest services for a guide on Enjoying disney with children 5 and under. Just ask them. They will know what you are talking about.
As for that weekend, I am not sure what special advents will be occuring, but you will be able to find out which activities would be suitable for your children's ages. Good luck. Enjoy your trip!!!