And a dear friend called and told me *she* was doing a Pirke Avot shiur at *her* shul this Shabbat. And she was doing an entirely *different* perek. These things are on a schedule, so I figured I was sunk.
No - my friend is on the proper schedule, and this would be the week for Perek Hey (Five.) But our shul is on its own schedule- we only do this when the rabbi is on vacation, and we start the first week he's gone. So I was right to do Perek Daled (Four).