The first weekend of the Austin City Limits Music Festival came with a soggy twist. Rain turned parts of Zilker Park into mud, and gates opened about two hours late on Saturday while crews cleaned up, the Austin Chronicle and Fox 7 Austin reported.

Once the music started, fans got a strong lineup. On Friday, Turnstile, Skrillex and Charli xcx played, and Charli brought out Australian singer Troye Sivan as a surprise guest, according to the Austin Chronicle. On Saturday, New Zealand singer Lorde headlined with an 83-minute set that the Austin American-Statesman praised for its energy and emotion. Young Miko and actor-musician Finn Wolfhard also performed.

Mud has become part of ACL lore. Zilker Park's grass and soil turn slick fast in heavy rain, and veteran festivalgoers often bring rain boots and ponchos just in case. In 2009, a storm turned the grounds into a famous muddy mess, and fans still talk about it.

Here is the background. ACL Fest began in 2002, inspired by the long-running PBS concert show "Austin City Limits," which started in 1976. The festival now runs over two weekends each October and draws about 75,000 people a day. It brings millions of dollars to Austin's economy, though some neighbors complain about noise and traffic.

The second weekend runs Friday through Sunday, Oct. 9 to 11, with a similar lineup. Organizers post weather updates and gate times on the festival's app and social media.

For fans heading out, closed-toe shoes and a rain layer are a smart bet if storms return.

What we know: Weekend one had rain delays, and Lorde and Charli xcx were standouts.
What we don't: What the weather will bring for weekend two.