Hedonia

Hedonia is an outwardly peaceful planet on which many different varieties of alien live together in harmony. Many of its tourist areas are organics only, so the average Autobot is well advised to use a holomatter avatar to scout out hot spots first, just so as to keep the peace. Notable tourist spots include the Temple of the Raging Prism, the Lube Pits and the Simultronic Suites.

Also, the Hedonians are also the best-connected arms traders in the galaxy.

Fiction

IDW Generation 1 continuity

The Lost Light stopped by Hedonia to allow the crew to take some shore leave. Rodimus advised everyone on the use of holomatter avatars, so when one particular group visited a bar, that's what they did until Ultra Magnus determined that it was "mech friendly". A night of drinking ensued. Cybertronian Homesick Blues Rewind believed that the civilization was too good to be true, and suggested it harbored some dark secret. As it turned out, that secret was arms trading, and Rodimus took the opportunity to purchase some proton missile launchers from the Hedonians. Signal to Noise