What: You don't have to be German to enjoy a good beer with friends some you just met. All are welcome at this two-day event that features German food, polka and Rocktoberfest bands, dancing, kaffeehaus, wine and beer from Munich. Lederhosen aren't required, but they sure repel those beer spills.
When: 6 p.m.-midnight today and 3 p.m.-midnight Saturday
Where: Sacramento Turn Verein, 3349 J St., Sacramento
Cost: $20 general, $5 for children 12 and younger
Information: (916) 442-7360, www.sacramentoturnverein.com
What: Country superstar Carrie Underwood's 55-city North American "Blown Away" tour stops in Sacramento. The former "American Idol" winner will perform new songs from her critically acclaimed fourth studio album. Opening for Underwood is Hunter Hayes, a multitalented musician and songwriter, who is winning fans with his single "Wanted."
When: 7:30 p.m.
Where: Power Balance Pavilion, One Sports Parkway, Sacramento
Cost: $45, $55, $65; $12 parking
Information: (916) 928-6900, www.powerbalancepavilion.com
What: Kevin Seconds, best known for his punk band 7 Seconds, celebrates the release of his new solo album "Don't Let Me Lose Ya" with a kick-off concert. After his Sacramento show, he hits the road for a national tour with Kepi Ghoulie.
When: 8:30 p.m.
Where: Naked Lounge, 1111 H St., Sacramento
Information: (916) 443-1927, www.nakedcoffee.net
Sacred City Derby Girls
What: Sacramento's Sacred City Derby Girls present a derby doubleheader at Memorial Auditorium. The Sacred Sacrificers will take on the Bay Area Derby Girls followed by the matchup of the Sacred Disciples against Sonoma's Resurrection Roller Derby.
When: Doors open at 6 p.m.; bouts start at 7
Where: Memorial Auditorium, 1515 J St., Sacramento
Cost: $20 advance, $25 at the door
Information: www.SacredCityDerbyGirls.com, (888) 588-7234
Sacramento Aloha Festival
What: Explore the beauty and culture of the islands without leaving Sacramento. The free event, presented by Hui o Hawaii of Sacramento, includes educational exhibits, workshops, a cultural village, Hawaiian and Pacific Islander entertainers, food and more. Organizers expect a big crowd, so bring your own folding chairs.
When: 10 a.m.-6 p.m.
Where: Cal Expo, 1600 Exposition Blvd., Sacramento
Cost: Free, $10 parking