Dog Days at the Splash is from 4 to 8 p.m. this evening, August 19. The cost is $5 per dog; humans (or hoomins, if you prefer!) get in free.
You can come without a puppy dog if you just want to watch the fun!.
Multiple organizations in Hutchinson maintain Calendars of Events. Check these to find something perfect for your trip.
Check out some local websites with detailed visitor information.