Caucuses have been scheduled to choose the Republican and Green candidates to run in Senate District 19, which consists of Sagadahoc County and the Lincoln County town of Dresden.
Republicans will caucus at 6:30 p.m. July 23 at the Smith-Toby American Legion Hall on Congress Avenue in Bath.
The caucus for the Green Independent Party is set for 7 p.m. Wednesday at the Topsham Municipal Building.
Democrats have not announced the date of their caucus.
No date has been scheduled for the special election to replace Seth Goodall, who resigned from the Senate this week to become the New England regional director of the Small Business Administration.