Pittaro recorded 32 hits during his career as a Nittany Lion.
The Nittany Lions beat St. Lawrence 4-1 last season.
Fessler served as a depth piece for Penn State from 2014-17.
The Nittany Lions will kick off their season on Thursday, September 26.
The event is free to fans but donations of $10 for adults and $5 for kids are encouraged.
TJ Malone, Jack Fracyon, Grant Haus, Alex Ross, and Mac Costin were recognized.