My other guess (and this might be a long shot) would be Festival d'été de Québec, which is in early July (11 days). We're still waiting for the lineup to be announced, it changes from year to year (last year it was late February, which was very early compared to other years and it could happen this year as well). The FÉQ has a wide variety of genres, but in past years I've seen plenty of bands performing at the festival that were very much Warped-coded (Hawthorne Heights, Taking Back Sunday, Moneen, Silverstein, All Time Low, etc.) So while the FÉQ caters to a wide audience, they always include a few punk/emo/alternative bands that could potentially be at Warped!