Any advice on hiding bfp from family til Xmas

My brother is coming home (navy) for thanksgiving and getting married, and my other brother is leaving for the navy the same day newlywed brother goes back. So how can I get through a bachelorette party, a wedding, and a going away party without drinking. Now I'm not a big drinker and they know this, but at these kind of things they expect me to lead them in drinking games and we always have a blast. Any advice? There are two nights that I would normally drink some beer with them.