Choreographers Jerry Mitchell and Larry Keigwin hosted the event.
The residency is part of Arena's American Voices New Play Institute.
Ten new works have been selected for the children's theater's 2014-15 season.
The hit musical from the 2013 New York Musical Theatre Festival will perform a cabaret at 54 Below.
Marshall will direct a new comedy about the making of the film-noir classic Double Indemnity.
Annette Bening also stars in the Public Theater's second free outdoor production of the season.
The off-Broadway production also stars James Wirt.
Adam Fitzgerald will direct the immersive production.
Comedian Kevin Meaney leads the cast of this musical revival.