The Qs go to Katherine's concert 

From February 1989. Tiffany is doing pre-concert press at GH for Katherine's benefit concert. Sean asks Monica for some help in seeing one of her patients, and Monica pitches in for old times' sake. In between helping out, Alan throws jabs at her about Ned and Dawn. Alan tries a bit of sincerity, but he blows it when he suggests they jump in bed to make things better.
The Qs prepare for the concert. Afterwards, they hit Kate's house for a reception where Alan gets drunk and hits on Yasmine Bernoudi. Monica watches in equal parts amusement and annoyance.
(Who knew Alan played clarinet? Ha!)