Nothing casts a dark cloud on outdoor party planning than the fear of bad weather. Years ago, I attended a fancy engagement party -- no, not mine-- at which it absolutely poured.
Thankfully, there was a huge tent with sides so dinner guests stayed dry, even if the sound of pelting rain drowned out conversation at times.
Years later, my husband and I hosted a summer party for his grandmother's 100th birthday and invited tons of people. We set up a food buffet indoors, with plenty of tables and chairs outside.
For some reason (money, perhaps?) we opted not to rent a tent. If it had rained, we would have been cooked.
Thankfully, the day turned out to be beautiful. But I know other people who have not been so lucky .‚.‚.