The Arsenal Center for the Arts and the Watertown Children’s Theatre will formally merge as of July 1. The change means the children’s theater will be fully integrated into the Arsenal Center’s educational programs, and will allow for more shared programming and combined membership outreach. Certain administrative functions for the two entities will also be combined where possible, according to a statement from the organizations. The Arsenal Center, started in 2005, will preserve the 30-year-old Watertown Children’s Theatre name under its umbrella, and will continue offering the same programming geared towards youngsters. The Watertown Children’s Theatre offers theater education programs, from full-scale musical productions to improv workshops to dance, voice, and theater tech lessons, officials said. For more information on the merger, visit www.arsenalarts.org.