DANCING ON THE STREET St. George Church sponsors an outdoor street fair with Ukrainian foods, dancing, and music. Friday, 4-11 p.m., Saturday, 11 a.m.-11 p.m., Sunday, 1-5 p.m., East 7th Street between Second and Third avenues, free.

HAPPY BIRTHDAY, KATE The Turtle Bay Association’s annual celebration of Katharine Hepburn’s birthday includes cake and live music. She was born in 1907. Saturday, 1-3 p.m., Dag Hammarskjold Plaza, East 47th Street between First and Second avenues, 212-751-5465, free.

CIVIL SOCIETY Artist Allison Smith organized “The Muster,” a weekend celebration of, well, celebrations. The event imitates Civil War reenactments in spirit, though attendees are invited to celebrate any identity or period of history they would like. There will be mock battles, campsites, portrait painting, a quilting bee, and soapbox orations. The day’s highlight is a formal “Declaration of Causes” (2 p.m.). Saturday, noon-5 p.m., Governors Island, free. Note: Free ferry service is provided from Manhattan, departing from Slip 7 of the Battery Maritime Building on FDR Drive at Broad Street. Please go to www.publicartfund.org for more information.

To submit an event for consideration for the Calendar, please wire the particulars to calendar@nysun.com, placing the date of the event in the subject line.