I'm in top shape and buff + tall, but I'm not a fighter, so MMA guys and boxers can easily take me out.

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I will be going to a big event tomorrow with my gf where there will be groups of two nationalities and sometimes when drunk quarrels and fights can erupt between these two groups (nationalities).

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I know that if I get beat up for some reason I will lose all face and respect in eyes of my girl, so what is best way to avoid getting beat up, since I don't know how to fight?

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One idea is that I won't be drinking alcohol at even, so in case shit breaks out I have better coordination and mental control.

I'm 6'2'' 200 lbs fits, so look strong, but that is about it.