Good luck with it and a great idea to have an exit plan and reasons for not drinking / sharing with your colleague however If you are feeling at all vulnerable and that you may struggle then a good idea maybe to cancel / not attend - I'm a company director but last year there was not a chance on this planet I could attend - the whole scenario was a none starter and the same applies this year - I know people will say you can attend and with your wife by your side for support things maybe somewhat easier but if you really do think you will find any difficulty then please consider this option too - it was one of the best decisions I have ever made.