GAY Prepare your bert hole...

How do Zac and Dave have time for all these shenanigans right before my wedding?

Because it's the weekend BEFORE we start to get busy, hence nonattendance to your wedding. I had my orgy planned that weekend FAR before your invite.
 
Is there something special about it? Its just a stout, right?

Sorta. Its only released once a year and you have to be AT Cigar City to get it. People fly in from all over the world to get some. It's one of the few beers that has gotten a 99 from Beer Advocate and 100 from Rate Beer. Last I checked, the bottle was selling for like $70 on Ebay.