Massachusetts Convention Fandom, Inc. (MCFI) is hosting Costume-Con 37. MCFI is a 501(c)(3) tax-exempt non-profit corporation.

MCFI was created in 1974 by the people who ran Noreascon (1971) under the auspices of NESFA. Its purpose was to bid for a Boston Worldcon in 1980. It ran Noreascon Two (1980), Noreascon Three (1989), and Noreascon Four (2004). MCFI also ran Smofcon 3 (1986), Smofcon 15 in 1997, Smofcon 25 in 2007, Ditto 11 in Newport, RI, November 6-8, 1998, the 25th World Fantasy Convention in Providence, RI, November 4-7, 1999, and Smofcon 35 in Boston from December 1-3, 2017. MCFI also ran several Worldcon bids, including Boston for Orlando in 2001 and Boston in 2004.

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