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.