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Updated: Here’s a look at the official full lineup.

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Now that Lollapalooza is confirmed for a full-on, four-day party with perhaps the usual 170 bands and 8-stage lineup, there will be the usual speculation about who is playing this year until 10 a.m. Central Wednesday when the official lineup is announced.

The Foo Fighters are a lock, we learned from frontman Dave Grohl in a video that features Mayor Lori Lightfoot announcing the festival’s return after going dark in 2020 due to the coronavirus pandemic. The video also features music from rumored act Journey and Chicago rapper Polo G, a past performer.

When Variety first broke the news that Lollapalooza for 2021 was likely to happen, the publication speculated on acts playing other fests that could fit Lolla’s playlist.

The three-day hip-hop festival Rolling Loud, with headliners A$AP Rocky, Travis Scott and Post Malone, will take place July 23-25 at the 65,000-capacity Hard Rock Stadium in Miami. New York is also moving ahead with its Governors Ball Festival in September, with a lineup featuring Rolling Loud performers A$AP Rocky, Post Malone, 21 Savage, Megan Thee Stallion and Dababy as well as more Lollapalooza-centric artists like Billie Eilish, J Balvin and Portugal. The Man. It seems likely that many of those artists would perform at Lollapalooza as well.

This year, proof of full COVID-19 vaccination or a negative COVID-19 test result is required to attend. For fest goers who are not fully vaccinated, a negative test result must be obtained the day before entry. Organizers said they will detail the festival entry process in early July.

Be sure to look for the official lineup 10 a.m. Wednesday at chicagotribune.com/entertainment.

Tribune wires contributed to this report.