The event will take place at the YMCA of Clay County, 225 E. Kruzan St., Brazil.
The forum will include all three Republican candidates, Alan Morrison, Bill Webster and Jim Meece, and Democrat candidate Mark Spelbring.
The 42nd District includes Posey Township, Brazil Township and Van Buren Precinct 1, along with Parke County, Vermillion County and portions of Vigo, Fountain and Warren counties.
House District 42 is new to Clay County. It is currently represented by Democrat Dale Grubb, who recently announced he was retiring from the seat.
The event is open to the public and all are welcome.
There is no admission.