After posting this photo we've learned more about it. From Carrie Phillips: "It could be the 50th anniversary May Day weekend."

She adds: My grandparents, Ray and Lucile Holcomb, are in the back row, 3rd and 4th from the left.

The first row include faculty members.

Persons identified on the second row are sixth from left, Wanda Suter Pannabecker, next is Earl Lehman. Arden Slotter is 13th from left. Robert Simcox is fourth from right.

Standing on the top row, Phyllis Simcox (seventh from left), Lois Sommer Kreider (ninth from left), Evelyn Nunnemaker Krehbiel is next to her.

Additional identification from Icon viewers is welcome.