Clifford's sendoff will take place at 6:35 p.m. on Saturday, July 15, at Medlar Field at Lubrano Park.
The addition lands the Nittany Lions' fourth offensive lineman in the Class of 2023.
For five days, the Leishman Trophy will be available for Penn State fans to look at from 10 a.m. to 4 p.m.
The Aces combined for 13 touchdowns this past season, ranking first in the Big Ten and second nationally.
Deion Barnes will immediately assume offensive/defensive analyst and analytics coordinator duties with the promotion.
Matthews is the first player to verbally commit to the Nittany Lions' Class of 2025.