Balkun Brothers.Saturday, July 28 

Now in its 16th year, the Greater Portland Festival of Nations offers a globe’s worth of music, food and family fun in Portland’s Deering Oaks park beginning at 11 a.m. Free. And tonight, Ukulele master Jake Shimabukuro shreds at Aura (121 Center St., Portland) at 9 p.m. Tix: $25+ (18+). 772-8274. auramaine.com. The duo Balkun Brothers plays maximum rock ’n’ roll at Bayside Bowl (58 Alder St., Portland) at 8 p.m. Free (all ages). 791-2695. baysidebowl.com. And at Portland House of Music (25 Temple St.), three of the best stoner-rock bands in the land — Murcielago, Scissorfight and White Dynamite — play a 9 p.m. show. Tix: $10-$12 (21+). 805-0134. portlandhouseofmusic.com.