Just go to the FinancialChat server and the Othernet server on IRC. Next, type in the list command to view all the public rooms. command is /list The best rooms on FinancialChat and Othernet are private (not shown in the /list) but a few of the public rooms are decent. Don't ask me to tell you which rooms are decent considering you can easily determine that on your own. Just be aware that there really isn't a chat room that's exclusive to Emini ES futures. Instead, these chat rooms have folks trading many different trading instruments that also includes the Emini ES futures. 8 years ago these chat rooms peaked with members...most had 7x as many members back then in comparison to today. The financial global collapse of 2008 - 2009 cleaned out most chat rooms and the growing popularity of Stocktwits.com is a new home for many of the former users of IRC. Stocktwits has a very active Emini ES futures real-time chat stream. If you're looking for an IRC chat room that only trades Emini ES futures, active and on IRC...there are none unless its private. Last of all, there's a difference between chat rooms and signal calling rooms. IRC is for chat rooms...there's no signal calling rooms (someone telling you when to buy and sell).
What exactly are you looking for? A traders chat forum? A signal calling room? A news forum? Just a Futures room?