I think it's a great move by Dunn to attend SoxFest. If he didn't, fans would be irate that he stayed away so he didn't have to "face the music." I really hope the fans aren't hard on him. I mean, seriously, give the guy a break. He heard enough last summer, give it a rest now.
If he's starts off tanking again during the season then the boo-birds can come out again (even then I don't like booing a player unless it's clear the guy doesn't care and is just mailing it in).
I know that's not how it works, though. Fans are going to call him every name in the book I'm sure. And that will really help Dunn do better this year!