Red Rocks Amphitheatre began its summer concert season on March 30 — the earliest start the venue has seen — and plans to welcome a record 200-plus shows and events by its end date of Nov. 15. But the estimated million-plus visitors in 2024 — at least half of whom are from out of state, according to a recent study — won’t see what really goes on at the 738-acre outdoor venue and park beyond the public aspects. In reality, Red Rocks offers dozens of unique challenges for fans, artists and production teams, who navigate steep stairs, twisting innards and decades of overlapping history to bring us each new concert. Here are five things about Red Rocks you might not know: Western History Department, Denver public LibraryRed Rocks under development for its current concert-venue use, likely circa the late 1930s.