Features Scooby-Doo mystery dinner is back on at the Ahern House A rescheduled Scooby-Doo Mystery Dinner is back on for the P.J. Ahern Home on Saturday, July 31. by Aaron Brand Jul. 22 2021 @ 4:41pm TEXARKANA, Ark. — A rescheduled Scooby-Doo Mystery Dinner is back on for the P.J. Ahern Home on Saturday, July 31. It runs from 6 p.m. to 8 p.m. with the mysterious shenanigans centered on the Texarkana Historical Society trying to open Texarkana's first museum. However, someone is attempting to sabotage those plans. This "Mischief at the Museum" mystery party was rescheduled for this day. Attendees will try to solve the mystery at this gathering meant for adults.