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The main factor in deciding when to hold your pool party will be the weather, unless you plan on having your party at a climate-controlled indoor pool. Choose a day with little to no chance of rain and high temperatures. However, if possible, avoid the hottest days of summer. Extreme temperature increase your risk of heat exhaustion. Plan your party on a weekend. This will allow for those that work during the week to be able to attend the party, and you can host the party during the day. If you'd rather have an evening pool party when it's not as hot outside, any day of the week could work. If you live in an area where rain is frequent, consider setting an alternate "rain date" for your party. This way, guests will know what to expect if it rains on the party day, and you can still have your party later. If you have a pool at your house, you can host your party at home. Otherwise, you'll want to look into local neighborhood pools and exercise facilities. Inquire about parties well in advance of when you'd like to have your party. Different pools require reservations and party fees. Depending on the facility, you may be able to rent the entire pool or just host your party during normal pool hours. You can either send your invitations electronically or as paper invitations. Make sure to send them out at least a week in advance. Use cute water-themed phrases in your invitations. Say something like: "Dive in for a night of fun with us at our summer pool party!" If you can hand-deliver your invitations, consider giving out a "message in a bottle." Roll up your invitations, and place them in clear plastic bottles. You can even add a bit of sand or seashells to the bottom of the bottles for extra beach flair. If you're inviting a lot of kids to the party, make sure to include their parents, as well. At a pool party, you want to have as much supervision as possible for maximum safety. Having a pool party theme will help you to decorate and decide on food for your party. Possible themes include: "Luau": Give all of your guests flower leis, and encourage everyone to dress up Hawaiian style. Decorate with tiki torches, and play Hawaiian music. "Patriotic Party": If you live in the U.S., and it's close to July 4, you might want to make your pool party a patriotic one. Decorate with flags and red, white, and blue. "Surf's Up": Throw a classic beach bash. Decorate with surfboard images, and play music like the Beach Boys. Place seashells around your tables for an added nautical touch. When you're planning a pool party, make sure to have plenty of pool supplies that guests can use and enjoy. Practically, have extra sunblock on hand, and some extra sunglass, since it will most likely be bright outside. Also, have a few extra towels, in case someone forgets to bring one. Even if you plan on having other drinks, make sure to have cold water available to party guests who get overheated. You can also have an array of pool noodles and rafts for guests to float around on. Encourage guests to bring their own, as well.
Choose a date. Find a pool for your party. Send out invitations. Create a theme for your pool party. Stock up on party supplies.