Photo courtesy Jay Jinge Hu A special event, Gather in the Garden, will mark the 30th anniversary of Garden Walk Buffalo on the summer solstice from 5:30-8 p.m. Thursday, June 20. Guests will gather in the garden designed by Ellen Biddle Shipman, known as the greatest garden designer in America in the first half of the last century, at the Forman Mansion, 77 Oakland Place, Buffalo. (Parking is available along both sides of Oakland Place.) Tickets are $125 per guest….