Indirect object... I think
Answer:
I don't no the answer sorry
The answer is they are going to rehearse a play. Somewhere else in Athens, a gathering of "Mechanicals" (a.k.a., skilled workers) get together to rehearse a play they intend to perform at Theseus and Hippolyta's up and coming wedding. Exclusively, they are Peter Quince the woodworker, Snug the joiner, Bottom the weaver, Flute the roars mender, Snout the tinker, and Starveling the tailor.