The chairman of Lakeville’s Board of Selectmen, Derek A. Maksy, said he will not run for re-election in the April 1 town elecction. Town Moderator Aaron Burke has taken out nomination papers for the selectmen’s seat, while Norman Orrall has taken out papers to run for moderator. Stephen A. Olivier, former selectman and Finance Committee member, is running for one of two seats on the Finance Committee. The deadline for taking out nomination papers is Feb. 8, and the deadline for returning them to the town clerk’s office with at least 46 certified signatures is Feb. 11. A special voter-registration session is scheduled for March 12, from 8 a.m. to 8 p.m. in the town clerk’s office.