and set up whatever "Notifications" you would like: click the little
triangle in the square next to the name of the calendar on the left of
the page and set up an event reminder.
Google Groups recognizes automatic mailers, such as calendars, with
annoying irregularity as spam-bots. So sometimes everything works and
then it unexpectedly stops working. Until I can find a reliable work-
around, just add the calendar with notifications to find out what's
going on.