Olivia Rodrigo is about to put one Southern California park through the ultimate stress test.

A staggering 45,000 people are expected to descend on Irvine’s Great Park at the end of this month for the pop princess’ inaugural Daisy Chain Fields festival — more than quadruple the crowd the park’s usual concert venue is built to handle.

After the city’s last massive July 4 event in 2025 caused epic traffic jams, officials aren’t taking any chances.

The sold out Aug. 29 bash is expected to be one of the largest events ever staged at the sprawling Orange County park. Rodrigo has assembled a star-studded all female lineup that includes Stevie Nicks…

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