The best things to do this weekend in San Diego: Sept. 18-20

This weekend in San Diego (Sept. 18–20), Bay Area and local audiences can choose from fall farm events and a full slate of theater openings and runs. At Bates Nut Farm in Valley Center, visitors can enjoy a pumpkin patch, tractor hay rides, a straw maze and a corn pit, plus dog-friendly features and additional activities in October; admission is free with weekend $10 parking and $2.50 per extra activity. Theater highlights include The Old Globe’s “Begin Again” (through Oct. 18) and Cygnet Theatre’s “Dear Evan Hansen” (through Oct. 4). Moonlight’s “Come From Away” runs through Sept. 26.