Yeah now that I think it through its possible but not likely. The clear comedy headliner for the night (arguably the whole festival) is Birbiglia. She will probaly be replaced with someone of similar size OR a big change all together with comedy that day. My bet is that the comedy for Sunday will be replaced with Birbiglia's off Broadway play (?) "My girlfriends boyfriend."
Do we know the timing of last years schedule release? or the previous years? I realize that Coachella hasnt but they almost never do until just days before. Sasquatch tends to be a little more timely from my memory. At least a day-by-day break out.
I agree that Monday night is weak. Frankly it almost makes more sense to have Rusko or Cake sub over The Lumineers. By far the weakest of the subs. I know this wont happen because of the poster order. If there was another sub to be added Monday is the day.