Robert Nicholson has resigned as Monson’s town manager to take over as Sebago’s town manager. Nicholson, who is attending the Maine Municipal Association’s convention this week, submitted his resignation effective Friday, Oct. 20, to selectmen last week. He began serving Monson in June 2005. Sebago has a population of about 1,500 compared to Monson’s population of about 700. Selectmen have advertised the position, and the deadline for applications is Nov. 14.