Not exactly what you asked for, but there's a pick-up folk music session at The Press Room, opposite the Post Office on Daniel St., in Portsmouth, NH, every Friday evening between 4:30 PM, and around 8:30 - 9:00.   We also have a monthly Shanty Sing at the same place one weekend of each month.

If this is anything you think you'd like I can give you beter directions or a map.

Dave