Out to the ballgame

I received these photos in the he mail yesterday from a woman named Becky Muth in South Carolina who is writing a fictional piece (https://beckymuth.com) inspired or supplemented by photos she came into possession of showing a baseball game that took place on May 31, 1920, Decoration Day. Photos are inscribed "NPHS-PHS" (North Plainfield vs. Plainfield High Schools). One of the photos is labeled on it's face, “Sammy Woldin", my maternal grandfather, who was then age 18. The others are mostly of spectators enjoying the game, no known relation, and a couple of unidentified players.