“404_not_found,” the flagship exhibition of this year’s Vector Festival, embraces digital ephemerality at Toronto’s InterAccess. Alicia Guo, Daze Jefferies, Ruby Justice Thelot, Alex Raja Ven, and Nara Wrigglesworth present works that explore online memory, broken hyperlinks, and generative potential of obsolescence. Together, they activate “the grammars of the ephemeral, the anti-archival, and the unfound,” writes curator Dallas Fellini.