Here's what I suggest. Reach out to the individual DISers by message to see if they want to join a new FE group #4. Even if you have one family say yes, put together a simple list of: family name, cabin number, and list of who is traveling with you (DH, DW, DD, DD) which ages as they helps make sure the gifts are appropriate. Share the list with the group and you're set to participate in the fun.
I suggest you message:
Tinkmom1 (that's you)
hendrsl
crstevens
Irving1023
You could have up to 6 families, 12 parents, 7 children.
If anyone has other suggestions, please share! This is my first FE and I booked late (6 weeks from cruise date) so I felt lucky to find five other families to join our FE group #3 so close to sail time. We kept it open for two weeks and closed at the 28-day mark for FE shopping and crafting.