1. Fat City Festival: The Jefferson Chamber’s Young Professionals spotlight upgrades in the Metairie bar-and-business district with a free concert by Bag of Donuts, food and drink and high school bands.

Saturday, noon to 5 p.m.

18th Street from North Arnault Road to Edenborn Avenue, Metairie.

(504) 835-3880.

2. Rusalka: Presented by the New Orleans Opera Association, the Czech opera “Rusalka,” by Antonin Dvorak, will have its New Orleans premiere with two performances this weekend.

8 p.m. Friday and 2:30 p.m. Sunday Mahalia Jackson Theater for the Performing Arts in Louis Armstrong Park. Tickets are $26 and up.

3. Central City Festival: The annual fête features Big Freedia and an attempt to set a new Guinness World Record for most people twerking simultaneously. There will be more music, dance, food with cooking demonstrations, children’s activities and vendors.

Saturday, 11 a.m. to 6 p.m.

1600 and 1700 block of Oretha Castle Haley Blvd.(504) 528-1806. www.ochaleyblvd.org.