Summer time is perfect for hosting outdoor backyard parties for families and friends, especially birthday parties and celebrations. So here is a big list of summer party themes and summer party ideas to help you plan and host a sizzling hot party in the summer. There are ideas for kids, teens and adults for ways to turn your backyard into a venue for a summer daytime or night-time, outdoor movie night, luau, outdoor casino, barn dance, teddybear picnic, pool party, food, games, activities…