Looking for Volunteers with Equine Experience for a few hours over the summer

We facilitate retreats with a NFP in Regina, and need volunteers to assist with the equine therapy sessions, so experience with horses is a must. Hours for retreats over 1.5 days would be Sat am (1.5 hours); Sat pm (1.5 hours); Sun am (1.5 hours).. First retreat May 14-15; Second retreat July 9 (1 day); Third retreate Aug 6-7). Other retreat during week (5 hours) - to be confirmed in June. The farm is 30 minutes east of Regina, about 1/2 mile off Highway 1.