Dave Grohl soldiers on as Foo Fighters return to Xcel Energy Center Aug. 22

Saturday: While there's been a spate of pop stars less than half his age canceling tours for more questionable reasons, Dave Grohl soldiered through a gig in Sweden in June despite breaking his leg a few songs into the set. The Foo father has kept up much of his summer tour plans since then, too, delivering hard-rocking 2½-hour concerts seated from a chair. We're not sure whether to hope the cast is on or off by the time his ubiquitous band returns to St. Paul, but we know fans will get their money's worth either way, even with the somewhat forgettable tunes from the new album/documentary series "Sonic Highways." Metal-reviving British duo Royal Blood opens. (7 p.m. Sat. $35-$75. Xcel Energy Center, W. 7th St. and Kellogg Blvd., St. Paul. 1-800-745-3000, ticketmaster.com.)