Aside from Mardi Gras, the most significant day for the city’s Mardi Gras Indians is “Super Sunday,” always the third Sunday in March, close to St. Joseph’s Day (March 19). Super Sunday 2020 takes place on March 22.

Super Sunday is the traditional day when the city’s Mardi Gras Indian “gangs” don their suits and march through New Orleans’ streets. Some of the beautifully beaded and feathered sui...