If it's on a weekend, it's OK to drink that early if you have a good reason. Remember...it's noon somewhere. 
I've never had the chance to do a DSG, but from the response everyone is giving I hope that opportunity comes around soon. Sounds like a good time.
'DGS' is short for 'Der Grosse Schlag'- it's a scenario that was run last November. There's usually a couple of scenarios per year, we just finished up Rangoon '42, and next we're running the Battle of Britain in November.
Der Grosse Schlag (German for The Big Blow) was just a really good scenario. It was based off of Galland's plan for the Luftwaffe to throw everything it had at the USAAF for a few weeks in late '44 (though IIRC Hitler rejected it). DGS flung 109's and 190's against B24's, B17's, P51's, P38's, and P47's..... it was really a great scenario.
Fencer, the Allied CO, apparently tried to run us out of fuel before he came into German airspace so us in the Luftwaffe had to racetrack (and sometimes rearm and racetrack again) for 30mins+ before the bombers came in... but, I tell ya what... when you're in the middle of 'who has the most fuel?', or boringly staring at your gauges, and all the sudden someone calls out "enemy fighters at 10 o'clock!".... man, that's the biggest adrenaline rush you'll ever get in Aces High.
I can't wait for BoB'08.