Millions of subscribers, thousands of fans, several days in Anaheim — the moment the people on the other side of the screen become real. VidCon is where the parasocial relationship finds its physical address. What it feels like to be there: VidCon operates on a different logic than most entertainment conventions. The celebrities here are creators who built their audience one subscriber at a time — the recognition runs both ways in a way it rarely does at traditional fan events. A creator who makes videos for 2 million subscribers genuinely knows the specific language and inside jokes of their audience, and the interactions in hallways and signing lines reflect …