I hope the other families thank you for these efforts. I travel every year with a big group (25-30) for a week to Disney World and find it frustrating to work with those who dont "follow the rules". This is what we do: Everyone pay for their own hotels, tickets, etc. Stay at the same hotel and if you can stay close to a theme park. We agree on one park to all start our day. I arrange one sit-down reservation for lunch ( this is often multiple reservations and i use the live agents to do this). We usually plan a spot to optionally meet to watch fireworks a couple of nights. We designate a nontheme park day to go to disney springs, waterpark , hotel pool, or moms arrange a spa treatment while Dads take the kids. Most hotels have outdoor grills where we will do a simple cookout on this day.
my biggest rule is we go when things arent too busy - not easter week or christmas week,etc
My advice:
getting a
disney travel agent to help is the best and first thing for such a large group
Can you all agree to stay at the same hotel? that would allow the kids to swim at the same pool every evening
to arrange any whole group get togethers would mean using a hotel with a convention center as they are accustomed to holding large group events and have the rooms to do it. One group event would be really nice - (get the money from the other families up front)--- e.g., Yacht & Beach Club, Contemporary, Swan & Dolphin, Coronado Springs, or if you like to play outdoors then the cabins at fort wilderness all have event areas
The best approach that others mentioned in the comments, get everyone to plan to start in the same park and then you will surely cross paths each day. i would imagine it is easier to do things together at the water parks as it isnt so structured.
A great group activity can be scavenger hunts or those "Bingo" challenges like i have seen done by Molly and team at AllEars.net
youtube
Different restaurants can handle bigger groups - Germany Biergarden, Hoop de do review, or agree to eat at Flame Tree BBQ at 1PM (or 11:30)