This is a great low-cost way to get your pet protected from some crazy raccoon that might come out of the Mystic. Ya nevah know.I've gone several times to this event, but I don't have to go this year because I got the 3-year vax for the cat. If you have records from your previous shot, bring it--and if it's less than a year you can get the 3-year. But you have to have the evidence.
Pro-tip: I keep my vax record with my pet carrier. If you had to evacuate to a shelter quickly, sometimes they require evidence of vaccination. I have the metal tag attached to my carrier and the paper records in the pocket of her carrier.
City tweet, share the protection: https://twitter.com/311Somerville/status/970748183000297472