On the first Tuesday of every month, interested couples can register at Room 413 of City Hall for a 30-minute wedding in the park. The office opens at 8 a.m. and you must register to marry with the proper fee — $90 via credit card or money order — and documents, which include photo IDs and Social Security cards or official papers with Social Security numbers on them for both people getting married. You also have to pay a $50 fee online through the Fairmount Park Conservancy up to one day before your wedding or bring a money order to the ceremony. Couples are expected to arrive 30 minutes before their time slot with their marriage license.