TwitchCon, the popular live streaming conference that was last here in 2022, is returning after bidding farewell to Las Vegas and cutting a deal to stay in San Diego through 2028. Expected to draw roughly 30,000 attendees when it heads to the San Diego Convention Center in September, organizers announced last week that they are planning to hold their European convention in Rotterdam this June, where it will remain through 2026, and “triumphantly return” to San Diego Sept. 20-22. Twitch, the live streaming platform that hosts the conference, did not say on its website what prompted the return t…