Bar requires proof of vaccination to dine in, giving customers peace of mind and last updated 2021-05-14 14:48:06-04 DENVER, Colo. â Vaccine passports--a document proving youâd had your COVID-19 vaccine--arenât widely accepted across the country, but for one bar owner, itâs how he believes he is keeping his business alive and his customers safe. Bar Max in Denver, Colorado prides itself on being a warm, welcoming space for craft cocktails, good conversation and community. âWe don't do screens,â said Bar Maxâs owner Marshall Smith. âWe don't give out the Wifi password.â Yet, finding that community and togetherness during COVID-19 has been nearly impossible.