Kesha plays Toyota Pavilion at Concord tonight — GA lawn, open-air amphitheater, the kind of show where the lawn is half the point. A pair of lawn tickets plus chairs was being transferred free via Ticketmaster through the r/SFbitcheswithtaste community after the original ticket holder couldn't make it.
Toyota Pavilion sits about 35 miles east of SF. BART gets you close: take the Antioch line to Concord Station, then it's a rideshare or roughly 20-minute walk depending on your tolerance. Parking on-site runs $20–$30 cash or card; get there early or you're hiking from the overflow lot. Lawn chairs are allowed for lawn tickets — confirmed by the original poster, who was including theirs in the transfer.
The lawn at Toyota Pavilion has a genuine sight-line advantage over the seated sections for a pop show with production this scale — you get the full stage picture without craning around a roof overhang. Food and drink options inside are standard amphitheater fare; bring a jacket because Concord evenings drop faster than you'd expect even in summer.
If you only have two hours: BART to Concord, rideshare in, catch the last 45 minutes of the set from the back of the lawn, rideshare out before the lot clears. The commute beats driving by a wide margin on show nights.