I vaguely remember Troubador as the place to be on Wed night. If so they have food. Food stalls are a bit sparse so early in the festival, so I usually bring some takeaway with me.

National Library is also having a lecture/concert with Andy Irvine on Wed night - From the Page to the Stage, Breathing New Life Into Dead Songs.
6-7.30pm, Theatre, Lower Ground One, LG1
Bookings essential - bookings@nla.gov.au, 02 6262 1271