Carnaval happens in March, but this week, Oakland’s SambaFunk! will bring its Brazilian warmth to the holidays with the third annual JOY dance party and samba competition at Shadow Ultra Lounge (341 13th St., Oakland). Newbies can learn the basics of samba during a demo, then join in the all-night, hip-shaking, life-affirming, funk-tastic free-for-all, with live performances by Funkternal, FunkTyme Playahs, Queens of SambaFunk! and Daughters of Funkquaria, plus DJ EPIC, who will spin soul, funk, cumbía, and R&B. The main event is the alegria de samba (“joy of samba”) competition at 8 p.m.: After answering a “JOY-ful” question, contestants will dance in their own style for three minutes, backed by live drums, in true samba style. Created by Oakland’s own samba king Theo Aytchan Williams, the evening raises funds for SambaFunk!’s dance and drumming classes for low-income families and youth, so strap on some sequins, shake a tail feather, and share the joy.