I saw a listing in 'GBH Magazine that The Taste of Allston event will be held on April 29 this year. It will be at the Doubletree Guest Suites in Allston from 6-8 pm. It costs $25 but WGBH members receive a $5 discount online or by showing their membercard at the door.
I went last year and there wasn't an overwhelming selection but it was fun, the music was good and there was a pretty good representation of local restaurants.
Here's the link to their website for more information.