It shouldn t be a requirement of attendance, of course if funds are tight, perhaps other family members could sponsor other members by paying their share. Don t expect everyone to just sit around and chat, of course. Kids will need to be kept entertained. It helps if the reunion will be held in a park with a playground, a home with play equipment and toys or a pool. If the party is in a rented hall, set aside a play area for the kids and have nearby members bring toys to share, craft activities.
Games are great for both kids and adults, and encourage interaction.
Stick with the theme when possible bring family photo albums to share, show old home movies and slides. The biggest obstacle to a family reunion is dealing with family members that don t get along, or are prone to causing difficulties. Encourage family members to put aside their differences for the greater good, if possible, and provide opportunities for people to avoid each other if needed. It can be a stressful, awkward time but it can also be an opportunity for reconciliation. Each member should have something to take home with them to commemorate the event, besides photos and memories.