Adventurers League Player's Guide (Tales from the Yawning Portal)

From the introduction:

The D&D Adventurers League is an ongoing official organized play campaign for Dungeons & Dragons. It uses the fifth edition Dungeons & Dragons rules, and features the Forgotten Realms setting. You can play D&D Adventurers League games anywhere. You can create a character and bring that character to any D&D Adventurers League game. D&D Adventurers League games can be public, in-person play events, but they can also be played at home or in another private setting of your choosing. Typical venues for these events are game and hobby stores, conventions, public-accessible game day events, libraries, your home, or anywhere you gather to play a D&D Adventurers League game.