The Knoxville Botanical Garden and Arboretum will hold its Fourth Annual Great Gardens event at the home of Jeanie and Chip Johnson with "Beer, Burgers, & Botanicals." The home offers a sweeping view of the Tennessee River and lovely gardens, and the party features a silent auction, music and food. Tickets are $75 per person; Annabelle Hydrangea Partners receive two tickets, a collector hydrangea and recognition at the event for $250. For reservations, call Emily at KBGA at 865-862-8717, email [email protected] or mail…