Now for some important details:
The event is sponsored by Arlington Center for the Arts. The event is free and open to the public. You do not need to RSVP and you do not need a ticket to attend. It's outdoors and the weather is predicted to be sunny and nice, although rain is predicted for the night before, so the streets could be wet and there may be lingering clouds in the morning.
If you need to set your GPS to a specific address, go to 327 Broadway, Arlington MA 02474 (the Starbucks on the corner of Broadway, Mass. Ave. and Medford Street). If you are driving, I recommend that you proceed down Medford Street about 100 feet and turn left to enter the connector road (technically, Park Terrace) to the Russell Common parking lot. Or just park on a street nearby. There are parking meters in the area, so I'm not sure how long you can park. The Russell Common parking area has a parking permit machine, and it's only 50 cents per hour, so that's cheaper than the meters. I'm not sure if there will be a waiver for the day in that lot, to accommodate fair goers. The MBTA 77 and 350 busses pass through that area, so that's an option.