My guild in Chester Co, PA, does coffee and snacks before the meeting for about a half hour. Once the meeting starts, we do brief reports from the officers and committee members, then show and tell by the members, then there is a brief break and the second half of the meeting is a speaker's presentation. In the winter when it's more likely that the meeting may be cancelled due to snow, we often have home-grown programs so we're not making a speaker travel for a missed meeting.
Generally people are friendly and happy to see new faces; I think you'll have a great time. If there's contact info on the notice that led you to the meeting, that person can probably fill you in on what that guild does more specifically.