Sorry for the delay. I stayed only for the first set. I hesitate to post because the party thrower apparently became the bassist and is now a member here. But here it is:
I arrived a few minutes before the band started and mingled with the party-goers after saying hi to the band. I noticed that one marshall half stack was mic'd, one Mesa half stack was mic'd, the other Marshall was DI'd; the keys were DI'd with the keys player running the board from his position in the left rear. The 1x12 Bass combo might have been DI'd, the drums were completely unmic'd, 3 microphones at front of stage. 2 1x12 powered mains with tweeters pointed at our chests. No sub. I'm not sure they ever ran a real sound check, board being in back and all. Since they had refused my offers for assistance in running sound, I chose not to address any of the issues I saw with the band.
First song started and, well, you know... drums and bass were nonexistent (front of house) except for cymbal crashes. Keys were actually overpowering the guitars. Vox were muted, but I think more of a stage fright thing than a levels issue. Guitars were loud and I think affected stage volume. I tried to remain unaffected, but by the third song, I approached them and suggested a few adjustments, including perhaps using a mic, any mic to reinforce the drummer. Some changes were made like increasing the bass in the mix, lowering the keys slightly, and raising the mains on their stands to an appropriate height.
The rest of the set was improved, but there were no extra mic for the drum kit so that was unchanged, and I think the keyboard player turned back up after I walked away. I made keyboard playing signs and volume down gestures to the party thrower and he finally had the keys adjusted to a reasonable level. From there it went as good as could be expected.
I stayed for the rest of the set and yelled my support for them. Some people danced, everybody continued to drink, and while nobody sang along, I think they all appreciated the effort and balls it took to get up there.
I think the biggest thing they had issues with were understanding the differences between stage sound and front of house, and the importance of each. It sounds like the drummer bailed after the show, but they are continuing with the bassist change noted above and perhaps a new singer.
Props to them for pulling of the show and carrying on.