You've probably only got to look for where they don't believe they can sell bigger.
I'd say RFP, Greenfield, Werchter and Mad Cool are very likely.
It's just not the hype booking for me. I considered it and for me it should stay where I was with them.
They announced it as "over 22,000" in the coach sale for 2024. So would imagine it's similar again this time out.
As of the most recent licence change, the total is 142,000 regular tickets on sale, plus another 5,000 Sunday tickets for locals.
The number of tickets on offer is only one of several factors in sell-out time, and probably not even the major one. Wouldn't read anything into anything in that respect.