Recitation sets have been replaced by Memory work (Teaching → Memory work in the sidebar): subjects and topics of flash cards and recitations that you assign to classes. Old recitation links now open Memory work.
House Trivia is now Class Trivia — open Memory work, then ⋯ → Class Trivia. You can draw from several topics at once, and house points are optional.
See the articles "Class Trivia" (under Houses) and "Memory work: subjects, cards & recitations" (under Teaching tools) for the full steps.