Question

look at this thesaurus entry:
rehearse
part of speech: verb
definition: to practice in advance
synonyms: perform, prepare, recite, repeat, train
which might you rehearse for?
a play
a board game

Explanation:

The word "rehearse" means to practice in advance. A play requires practicing (rehearsing) lines, actions, etc., in advance. A board game is typically played without prior rehearsal in the same sense as a play; it's more about playing rather than rehearsing. So you would rehearse for a play.

Answer:

a play