I don't think NCAA rules will permit high school regular season, in season tournaments or all-star games on campus. State championship and semifinal games are permitted but may conflict with the NIT if RU hosts any of those games. RU can definitely hold team camp or elite camp games on campus.
For example, I was at the USF Elite Camp yesterday they had approximately 100 Florida kids in the class of 2020, 2021, 2022 and 2023 on campus. Each team played 3 games. One was in the men's practice gym, one in the women's practice gym, and one was in Yuengling Center on the main court.
Best Elite Camp I've ever attended on a college campus.
I was also at their team camp. They had 104 schools, varsity and JV, that paid $399 each (fee included 4 games + a camp tee shirt for each player and coach).