By Denny Dyroff, Entertainment Editor, The Times  This weekend features a trio of significant “holidays” – Juneteenth, Father’s Day and Summer Solstice. Kennett Square’s Juneteenth Celebration (historickennettsquare.com) will be held this weekend along with other Juneteenth events at locations around Chester County. Juneteenth is an African American tradition that commemorates the June 19,...