Yes, Sonic Youth has ALWAYS been huge in Chicago.
Not sure if you need it, as I haven't read the whole thread, but I have a copy of Daydream Nation (just regular single disc version) for sale or trade, if you are interested.
I was at the Public Enemy / Sonic Youth show in Chicago where there was literally a riot in the streets afterwards.
2/18: Ghost In The Ruins / Maiden Chicago / The Mob Rules
3/17: Iced Earth / Warbringer / Ghost In The Ruins / Depremacy