Community Board 13 is meeting tonight to discuss Marty Markowitz’s pet project for a $51,000,000 amphitheater and arts center inside the landmarked Child’s Restaurant on Surf Avenue in Coney Island. Community organizers are urging residents to come out and testify in support of the community garden next to the former restaurant, which could be bulldozed for the 5,000-seat theater. Local gardeners have just finished reviving the Coney Island Boardwalk Garden in the wake of Sandy’s destruction, and they don’t want to see it bulldozed for a new development. It was designated permanent “Parks Open Space” in a settlement between the City and the Attorney General’s office in 2002, when more than a dozen gardens were threatened with demolition in 2002. The meeting is 7 p.m. tonight at Coney Island Hospital in the 2nd floor auditorium.