I've been interested in going to a large Magic tournament for a while now, though whether I can go and how far I could travel varies week by week.
I know how to look up the Grand Prix schedule and SGC tournaments. But I keep being surprised by other events — such as TCGPlayer tournaments, a different SGC formats, even PTQs, — only finding out about them when it's too late to make plans to go.
How can I make sure I'm aware of big tournaments near me with more lead time? Is there a resource that can show me tournament schedules from more than just one sponsor?