UPDATE: Herald says it's changed the time of its forum to "accommodate a scheduling conflict by some candidates," which is certainly an artful way to put it.
Marty Walsh, John Barros and Bill Walczak say that on the evening of Sept. 9, they'll be honoring their commitments and appearing at a mayoral forum sponsored by MassCreative, which was announced weeks ago, rather than the forum announced just yesterday by the Herald, Suffolk University and NECN.
Walsh, who has a top advisor who's pretty well known in local arts and entertainment circles, tweeted: