L.A.
Great idea to have the party early.. We are all middle of summer birthday people.. Do be prepared for not many people to be in town. We have not been able to have over about 6 kids to our summer parties, but that has led to lots of fun for those that do attend.
The Theme could be
"Fun in the sun".
Set up as many water activities as possible.. Water sprinklers, slip n slide, Water guns are also fun. I noticed Target has a 103" pool on sale for only 14.99! For that price you could have 2 in case there are a ton of kids. Order an Ice Cream cake and you could do a hot dogs and Watermelon.
Of course I love a pinata at birthday parties.. Fill it with bandades, tattoos, hair accessories, and some candy.
or gum that will not melt.
If you just have a few friends, you could do to a movie and then go for pizza after wards.
Have a blast and congratulations on your baby!