Every summer the city of Millcreek does a really fun outdoor series called Venture Out! Fridays. It runs on Fridays from June 9th through August 18th starting at 6pm. It ends with a movie at twilight. Every week the party is held in a different Millcreek Park. And each Friday has it's own theme. They have vendors there to support the theme, a local musical act and then culminate with a movie that fits the theme too. You can expect to find climbing walls, train rides, petting zoos, pony rides, bounce houses, a Mario Kart Games Trailer, and many more that change with the week's theme. Here's a copy of the schedule: 

There's a great brochure that details out each week's theme, booths and activities, musical guests, and movies. Check it out by clicking on the link below.