How to reproduce:
# create event and select some other users as invitees to it
# edit event and remove all of the invitees from it
# add Panel to Dashboard that would show "Upcoming Events" list
# see that it's showing "Attending: ..." text with former invitees
This is happening because invitee status (attending, uninvited, etc.) isn't taken into account, when printing invitees in event list.
Maybe same code, that list invitees on event detail page should be used in list as well.