Fluffy installed 2 instances of a multiuser feed plugin in mu-plugins directory. One of them is called wpmufeed.php and the other is wpmu-future-feed.php. Need to modify wpmufeed.php to exclude certain blogs (in this case, the events blog) and need to modify wpmu-future-feed.php to only show one blog (in this case, the events blog).
Update: the two instances of the plugin was giving me errors (because a class got redefined), so I renamed wpmu-future-feed.php to wpmu-future-feed.phps.