Barnwell was the only player committed to Penn State's 2023 class.
The museum's capacity will be limited to 30 people once it reopens to the public.
Penn State hopes the decision will ease high schoolers' anxieties while testing is disrupted by the coronavirus pandemic.
The event will take place 11 a.m. to 2 p.m. from Tuesday, January 26 through Thursday, January 28.
The new ice cream shop will offer a variety of Berkey Creamery favorites each week.
Reaves previously played for the Dallas Mavericks after going undrafted after the 2019 NBA Draft.