Ahmad Jamal
7:30pm at Millennium Park; free
As a pianist, composer, arranger, theorist and teacher, Ahmad Jamal's influence has echoed for well over five decades. His innovation as a composer has stretched the boundaries of music, and has influenced everyone from Miles Davis and John Coltrane to De La Soul and Jay-Z. At 80, he is still touring regularly, and his stop at Millennium Park will be a nice warm-up before this year’s Jazz Fest. Hopefully the rain will stay away long enough to make an enjoyable show.

Nerd Fest 4th Anniversary Celebration
7 p.m. at Holiday Club; $10 in advance, $20 at the door
Help Nerds at Heart celebrate all their geeky glory with this mixer for single straights and GLBTs, featuring video games, board games, comedy performances and maybe some brainy romance.

Back to School Toga Party
10 p.m.-2 a.m. at Y Bar; $20
Get in the college spirit with a hosted Belvedere Vodka reception, jungle juice and jello shots at this River North hot spot. Toga! Toga! Toga!