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A model trained on 15 years of Garten openings, hourly weather, lineup tags, and the season's base rates. Within two weeks of an event it uses the live weather forecast; further out it falls back to climatology. We don't get inside information — we just guess from the outside, in public, and tell you our work.
Don't plan your night around this number. The Garten opens because someone with keys decides to open it. We just guess from outside. If we're wrong, it's because we were wrong.