I have on occasion missed a couple of doses of met on my GPs suggestion - not for social purposes but when I had a tummy bug - my GPs advice was missing it for a couple of days as long as I was careful with my diet (whatever that means?) wouldn't affect my bs too much. Also I once went away for a weekend and didn't take enough of my metformin with me. Went to a pharmacy who could give me an emergency supply but would take 24hrs - as I was going back home the next day I didn't bother and it didn't seem to make a difference but I was strict food wise.
Not telling you that it's ok to do it - no one can or should do that, just giving my experience so you can make a decision - enjoy your day - to be honest life will always throw these things at us we have to decide how we are going to manage it - you can take Imodium with met and glic but check with the pharmacist if you do this just to be sure it doesn't contradict with anything else.