MM1 Wallkill Valley Regional High School’s Performing Arts Department will present the musical ‘Mamma Mia!’ on March 7-9. (Photo provided) ‘Mamma Mia!’ at Wallkill Valley next week Wallkill Valley Regional High School’s Performing Arts Department will present the musical “Mamma Mia!” next week. Shows are... Local News 24 Feb 2025 | 02:25