Hi I.G. -- attached is the link for Mt Major snowmobile club,who maintains the trails from New Durham to Mt Major and over towards Gilmanton. Email the club and ask Joann, the secretary, (and my neighbor) about any trips they may offer. they meet during the week up here, and are very active.
http://www.mountmajorsnowmobileclub.com/
PS: Winter Festival in Alton Bay is Feb. 19, a Saturday. Hope to see you again this year.