need help!!

St

so my house has been "volunteered" by my hubby for a family reunion in August. I know I have plenty of time until then but I'll have over 100 people at my house camping in my backyard not a problem since we have the room to do so. I've decided on a picnic-y theme. red and white checkerd table cloths and burlap. I need help figuring out the little touches like center pieces, decoraround the house, kids games, just random ideas that help lol. I'm having a mental block and want to have most of this planned out WAY before so I don't have to run around doing stuff like I usually do instead I can have a good time too. please help! Lol anything helps