Downtown Vista, May 24th. Free admission. E Broadway and Indiana Avenue turns into something that only happens once a year and only happens here — a whole town not performing its festival, but actually having one. The Strawberry Queen coronation is not ironic. The Strawberry Idol competition is not curated for an outside audience. The parade down Main Street draws people who've watched it for twenty years and people who moved here last spring and can't believe this is real. Vista does this with the confidence of a place that knows what it is and doesn't need validation. Food vendors line the blocks — strawberry shortcake in its honest form, …