7-Lake Afton Public Observatory: Free admission for mom's and grandma's w/ paid child's admission on May 7 9pm-11pm. See Saturn, a cluster of stars, etc. through the 16" telescope
9- Botanica Garden's: Free admission for the entire family on May 9 from 1pm-5pm
9- Sedgwick County Zoo: Free admission for mom's on May 9, 8:30am-5pm w/ paid child's admission
Of course there are also lots of River Festival events this weekend that are free w/ your River Fest button. Go HERE to check out this year's schedule of events.