1. Jim Monaghan’s 19th Annual Halloween Parade

6 p.m.: The late Jim Monaghan, founder of Molly’s at the Market, knew how to draw a crowd. Revelers march and ride carriages from Molly’s (1107 Decatur St.) to the Erin Rose bar (811 Conti St.) for a costume contest before returning to Molly’s.

mollysatthemarket.net/halloween.

2. Eat, Drink, and Be Scary Costume Party

6:30 p.m.-9 p.m.: Built in the 18th century as the seat of the Spanish colonial government, the state museum’s historic Cabildo on Jackson Square is the setting for this annual costume bash.

friendsofthecabildo.org

3. ‘Rocky Horror Picture Show’ at The Prytania

12:15 a.m.: Costumes are always part of the program for ‘The Rocky Horror Picture Show,’ and they should be out in force when the Prytania Theatre shows the audience participation cult classic film tonight. Get tickets in advance at

prytaniatheatreneworleans.com