New York City Mayor Bill de Blasio on Sunday marched in and delivered remarks at the 15th annual St Pat's For All Parade, an LGBT-inclusive parade.

De Blasio earlier said that he will not march in the city's upcoming St. Patrick's Day parade, the nation's largest, because gay groups are excluded from participating.

“This is a parade that celebrates inclusion,” de Blasio told a crowd of a few thousand. “That is what the city is about. That is what has made this city strong.”

Meanwhile, South Boston's annual St. Patrick's Day parade, the nation's second largest, may welcome a gay rights group for the first time in its history as part of a deal being brokered by Mayor Martin J. Walsh.

(Related: Boston may allow gay group in St. Patrick's Day parade.)