Thursday, May 18 is Ascension Day. As a result, Campus Hasselt and Campus Diepenbeek are closed for ALL activities from Thursday, May 18 till Sunday, May 21. So you won't be able to visit the Campus library in Diepenbeek during Ascension weekend.
Law Library Limburg, however, is only closed on Thursday, May 18. On Friday, May 19, and on Saturday, May 20 the library is open from 9 am till 5 pm.