Museums in East Otto, NY

Awald Farms in North Collins, they have fb page and there is also bounce magic in Hamburg/OP area but that would depend on your children's ages

https://www.facebook.com/HenHawkAcres/

Just Fun Hamburg

Hen Hawk Acres has strawberries to pick.

There is Rolly Pollies in OP, if your kids are 9 and under.

Check out your local library for events, most of them even have FB pages you can follow and get updates about events from. Toddler time, craft and story hours, free concerts and more. The Collins Friends Meeting will be having a Butterfly Release on July 2 nd. That weekend is also the Collins Liberty Festival, with music and more until the fireworks. https://www.facebook.com/events/1947744692163942/?acontext=%7B%22 source%22%3A5%2C%22 page_id_source%22%3A275718846224766%2C%22 action_history%22%3A[%7B%22 surface%22%3A%22 page%22%2C%22 mechanism%22%3A%22 main_list%22%2C%22 extra_data%22%3A%22%7B%5C%22 page_id%5C%22%3A275718846224766%2C%5C%22 tour_id%5C%22%3Anull%7D%22%7D]%2C%22 has_source%22%3Atrue%7D

https://fun4 kidsinbuffalo.com/event/festival-of-fathers/

Not really local area, but some of the non-local ones could be worth a little trip. Especially when it's free and suits a family's needs. https://fun4 kidsinbuffalo.com/event/free-outdoor-movie-night-canalside/2017-06-20/