The tavern was created after a race of sentient aliens called Chirpsithra landed on Earth.

They enjoy mild electric currents, whose effect on them is similar to that of alcohol on humans.

Units of currency used for Chirp-Human commerce are the "svith" and trade markers, mentioned in the story "Cruel and Unusual".

When they first put their mile-wide bubbleships into orbit around the Moon and landed in Siberia, they brought a host of aliens with a desire to eat, drink and socialize, thus the Draco Tavern was designed to cater to their individual, very diverse, and often conflicting interests.

[1] Notable stories include "Limits", in which Schumann overhears some traders talking about humans' limited lifespan giving them a unique approach to mathematics, thus justifying withholding the secret of immortality, and "The Green Marauder", in which a very old Chirpsithra discusses working with an extinct Earth species from the early development of Earth's ecosystem before photosynthesis poisoned the atmosphere with oxygen.