Richmond is buzzing this weekend — from live trivia on a trolley, to carnival rides, big-name concerts and even a cat video festival. Friday 🖼️ It’s First Fridays in the Art District, and new this month: A free trolley running through the event, with live trivia happening onboard. 6-8pm. Free. 🎡 A pop-up carnival will be in the Chesterfield Towne Center parking lot, nightly and all day on the weekends through Sept. 13. Admission is free, ride…