Seems like a good opportunity for me to advertise my services or agency, right?
Yes and no.
If you are an organiser, we think the best way to advertise yourself is by being useful, being present, and being you. We think it's cool if, for example, a Jam is held in an agency office, and the agency people really get involved. But we don't think it's cool if any local Jam is heavily "branded" by the organisers. We think a "Work•Play•Experience Jam" would be deeply cheesy - a Jam is supposed to be open, and plastering our logo everywhere would only make other agency guests uncomfortable.
You're a host, so think of it as a party. Would you write your name on every wall?
Banners, balloons, bowls of visiting cards - OK. But from your sponsors (if they insist), not from the host.
Please do not put your agency's name or branding your Jam's name or logo. It is great to show your own branding somewhere with your sponsors' branding, but please not in the logo area or name. Your logo might reflect your town, your country or anything you like, but not your commercial brand. Keep the Jam open please! Thanks!