Weddings, corporate events, a reading, a short run on your dark nights, a local orchestra, a touring show between stops. Organizations that treat rentals as a real revenue line build income that doesn't depend on how their own season is selling — and that line keeps climbing year over year.

D.C. just passed the strictest ticket resale law in the country — a 10% cap, a speculative ticketing ban, and licensing for high-volume resellers. Here's what's actually in it, what's enforceable, and what it means if your state is next.