Tomorrow's rehearsal is on, as described in the email yesterday, except for the food sharing at the end. That, being unnecessary, is canceled.
Costumes? Sure! It's Halloween, after all.
Same rules are in effect: If you are sick or have been quarantined, or you are aware you have come into contact with the coronavirus, fill out the attendance form and STAY HOME.
Concert in 2 weeks! So let it be written, so let it be done!