Please join Save Coney Island this Saturday morning for a demonstration to preserve the amusement district’s endangered historic buildings.

Four of Coney Island’ s most historically significant buildings — three more than a century old — are in danger. Demolition appears imminent. Developer Thor Equities has thus far ignored the pleas of leading historic preservation groups.

We need to raise our voices and say that we want these …buildings saved.

One of the endangered buildings, the Henderson Music Hall, is where Harpo Marx made his stage debut, alongside his brothers Groucho and Gummo.

That’s why we’re giving our demonstration a Marx Brothers theme — ”A Many Marxes March to Save Coney Island’s History.”

PLEASE JOIN US!

WHEN: Saturday, Oct. 30, at 11 a.m.

WHERE: Meet near the corner of Stillwell and Surf Avenues in Coney Island

WHAT TO BRING: Yourself and your friends. Signs focused on the importance of saving these buildings and preserving Coney Island’ s history are welcome. (We are trying to keep our message as positive as possible.)

WHAT TO WEAR: Costumes are optional but welcome. In particular, we need Groucho Marxes and Harpo Marxes! (Groucho glasses are available for $5 at most Halloween stores.)

AFTERWARD: Stick around to watch the brand-new Coney Island Children’ s Halloween Parade at noon.