Hi there. I suggest contacting Disney group events and asking what they can suggest regarding FastPass+, maybe they can even help set things up for you. Last month, I toured the parks with a group of 15 and it was very, very frustrating. Some background- we were there for my wedding, some people had been to Disney before, others hadn't , some took time to read up on fast passes, others didn't, some bought their tickets ahead of time, others didn't, etc.
Here are some of the gotchas I experienced:
-two of our guests were confused about linking under
MDE, even though they had accepted my "friend" request, they thought they needed to associate their park ticket with me. Luckily we noticed this at the last minute or they wouldn't have been able to get into the park (I wasn't with them when they were entering the park)
- one member didn't want to "test" anything so refused to get a magic band. This wasn't really a big deal, we just had to wait twice for each FastPass as they dug their Key out of their purse.
-several members either waited a really long time to accept my friend request, buy their ticket, or associate their ticket with their account so by that time, there were no more spots during some of the FastPass times I had already picked, I was able to "extend" my reservations to them but MDE showed a message that one or more of the times I had wasn't available so it had given my friend the next available time. So, some of us had a FP for Soarin at 11, hers was made for 3....
-one member decided she wanted to stop at DHS before we were all meeting at MK later in the day and decided to get a FP for toy story.....which then meant she couldn't get any FP at MK, so, she had to sit and wait for us while we rode.
-you have to copy all your selections, we had numerous times where we just wanted to ride one ride together and have different FP selections for our other two options. So, to get the one the same, we had to copy them all, then change the other two. This doesn't sound like a big deal but when you are needing to help a bunch of people do this several days in a row AND MDE kept crashing on my IPhone while I was in the parks
-somehow, when my mom set up my dads account, It was set so that I couldn't make FP selections for him. When I logged into MDE as her, the settings said I could....so, we still don't understand what was wrong. So, for each day, I had to copy my selections to my mom, then log in as her and copy her selections to my dad.
So......if Disney group events can't help you:
-make sure everyone understands how FP works
-make sure everyone has accounts
-link park tickets to the account
-break your big group into several smaller groups and have each group link their accounts
-then have each group leader arrange the FP for the entire group
Hopefully, someone else will reply saying there is an easier way.
The one other thing..By default, .I could see everyone's reservations - hotels, meals, FP....there was a little drop down box where I could say I only wanted to see my items but I had to do this every time I went into MDE. It got really confusing seeing everyone's FP times...so much so that I had to write down my times on a sheet of paper...otherwise, I had to fool around with MDE for a good 10 minutes (see note above about constant crashes) in order to see what time my next FP was.
Best of luck to you! Let us know how it all works out.