N.H. Rev. Stat. § 654:27-a
In cities and towns, the supervisors of the checklist shall meet at least every 90 days for the purpose of periodic checklist maintenance. For the purposes of this section, "periodic checklist maintenance" means taking action on all requests to correct the checklist including, but not limited to those in RSA 654:36, RSA 654:36-a, RSA 654:36-b, RSA 654:37, RSA 654:37-a, RSA 654:39 III and RSA 74:18, VI. For the purposes of this section, "take action" means to strike a voter from the checklist, correct an address for a voter who has moved within the jurisdiction of the supervisors of the checklist, or to vote to mail a notice pursuant to RSA 654:44, I. The supervisors may also conduct other business at these meetings after performing periodic checklist maintenance. Notice of the day, hour, and place of each session of the board of supervisors shall be first posted in 2 appropriate places, one of which shall be the city or town's Internet website, if such exists, or shall be published in a newspaper of general circulation in the city or town at least 7 days prior to each such session.
RSA 654:27-a