If your primary interest in the Guiding Star Grange is for the contra dance scene, here are a couple of primary places online where that community hangs out:

PVCD (Pioneer Valley Contra Dance) mailing list

Lightly moderated email list, hosted at Yahoo! Groups, open to all. Purpose: "Friendly and open forum to announce any events of interest to the contra dance community, to arrange for carpooling, get directions and/or information on other dances and any other ideas, share thoughts or concerns." Subscribe to daily or digest email, and/or read current or archived discussions on the web.
(To subscribe, click on the blue "Join This Group!" button on the group's web page, or send a blank email message to pvcd-subscribe[at]yahoogroups [dot] com.)

The Greenfield Contra Dance is Awesome Facebook group

Open to all (requires free Facebook account). Some discussion, announcement, ride-sharing; excellent source of photos from local dances, thanks especially to prolific pro photographer Roger Katz.

Friends of the Guiding Star Grange Facebook Group

Open to all (requires free Facebook account). Information about our community and our building, photos, announcements, and other posts specific to the FGSG and its mission.