Conditional URL Rewrites in WordPress

I'm hosting an event and using WordPress to manage the site. We have a separate table (not WP user table) of attendees and I'd like for each of them to have a page on our site:example.com/user1, example.com/user2, etc. I've been reading up about WP_Rewrite but am a bit confused about how to conditionally redirect if the user exists, otherwise go about the normal flow.Any help in achieving this would be much appreciated, thank you!Edit:There is a single one-off page that I'm trying to forward to. Right now, it's accessed with:example.com/user?username=user1
 
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