Based on what? They're playing in Huddersfield the night before at a big event. They'll get off stage, full of adrenaline, no doubt indulge a little bit.
They'd have to either travel down towards Glastonbury immediately after their huddersfield gig late into the night, or get up the next morning and set off no later than 8am to make sure they arrive at the festival in time, leaving enough time to get to where they need to be within the festival.
Don't get me wrong I would love it, but the odds are very much stacked against.