Most crew hires are not directly influenced by film commissions. Companies usually hire a unit production manager or line producer, often a local, who may have input into the employment of department heads, who often determine others employed.
Make your name and talents known to these people, so they look you up when hiring. Sometimes the usual suspects are on other jobs, and opportunities arise. Networking with crew members (even in other departments) will give you leads on commercials and other projects not included on the hotline.
Networking at various industry organization meetings and events are good ways to make yourself known in the community. Also find individuals and companies listed in the DFCI Creative Directory.
See the link below for local industry organizations.
Industry Related Networking Resources: