Choose to do things and go places that don't involve alcohol. Do family stuff that includes the wives and kids. Lunch at a place that doesn't serve alcohol- that can be tough since most places do but it IS possible - and perhaps limit the time you spend with just him, and make it not every minute. If you can explain to him you are not drinking, do it; if not, maybe you need to white lie through this one why you are not.
You said this is a vulnerable time for you - do everything you can to protect yourself. If he is really a friend- if you are spending family-related, and linked-by-family time with him, he should still be there as a friend now that you are sober. 8 days is a lot to "chance it" - to put yourself to a test that clearly makes you apprehensive...lean on your wife, again, make plans that don't involve drinking, come here for reinforcement.
You did 8 days! Here's to it being 9, then 10, then 12 by the time visit is done!
Good luck.