There is no special events, but you can visit Gveleti Waterfall near Stepantsminda. Nice place for walking with kids, there are a lot of Eagles! In Gudauri you can use Gondola. Ticket costs 12 Gel for 1 person (included 3 rides: gondola and 2 ski lifts to highest top of Gudauri ski resort - Mt.Sadzele (3200m), there is no snow at summer but could be a little windy) near gondola there is play ground for kids ;)