Olivia Rodrigo’s star-studded new festival earned rave reviews for what happened on stage — but getting out was a show of its own.

Some 45,000 concertgoers packed Irvine’s Great Park for the inaugural Daisy Chain Fields festival on Saturday, with many blasting authorities over a post-traffic meltdown that allegedly left attendees trapped in parking lots, wandering miles in search of rides and even taking traffic control into their own hands.

The sold out Aug. 29 bash was one of the largest events ever staged at the sprawling Orange County park, with an all female lineup assembled by Rodrigo that included Stevie Nicks, Chappell Roan, Doechii…

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