I agree with OP too. when i read your post, it smells like your GF planned this without asking you or to possibly BAIT you into drinking....does she miss you drinking with her? even if she does not have a problem, she may not prefer you to have the willpower.
whatever, i think it wasn't a NICE loving gesture. it sounds selfish and that she seems to be pushing the booze or setting you up to be anti-social. i hope you have a good sober weekend and enjoy some pleasurable activities....A house full of partying drunks would annoy me even if I was still drinking....i hate to clean up after hosting.