I would say if you are not comfortable being around unmasked people don't go yet. The mandatory mask policy unless eating or drinking doesn't exist in practice. South end was also more crowded than the ticket seating plan indicated but none of that was unexpected. Its outdoors and there was a breeze so the air circulation was good. The person I was with didn't feel comfortable eating at the seats due to the number of unmasked people nearby but felt fine doing so on the concourse. I've been fully vaxed for a while and double masked throughout and felt comfortable going and being there but living with immune compromised people I will defo be careful at home the next few weeks by masking and isolating more than I did before going to BMO. It did feel fantastic to get out though and see a game in person just be prepared to be more exposed than you might expect