I should have clarified this in the question itself. You only get
one "ballot" to vote, but you may mark multiple nights on that ballot
(sort of like IRV). So, if you're free on Tuesday and Thursday
nights, you can vote vote for both of those nights.
And, yes, Michael, you can go back in and "edit" your vote if you're
free on more than one night a week.
- -----Original Message-----