It's always puzzled me how bands like blink-182, Green Day, Fall Out Boy etc have never had a proper look-in at Glasto, despite their massive mainstream appeal.
Especially now as almost every other genre is represented, from the more obscure (metal as extreme as Gojira / Napalm Death) to the completely 'mainstream' (Sheeran/Cyrus etc).
Where's pop punk been this entire time? While some have made the occasional appearance (Panic at the Disco), it's certainly never been a regular feature on the lineup. It feels like a bit of a shame, as in their hey-day some of the biggest pop punk acts would have been great on the farm and offered even more variety!