Last year we created a GottaDEAL server on Discord for us to chat about Black Friday or whatever else.
Here's the invite link: https://discord.gg/3hd2K5t
For those who are unfamiliar with Discord, it is a free text, voice and video chat service. You can access it via their apps or through a traditional web browser. Once you sign up for an account you can join the GD server using the special invite link above and can chat with everyone else who has signed up.
One advantage of using Discord over the old forum chat function is that you can view past conversation in the channels and not just what is happening while you are there so can come and go without missing anything.
Currently there is a #general channel for more off-topic chat and a #blackfriday channel for discussing Black Friday. There's also a #contest channel that we'll use for some giveaways over the next few months.
We had over 500 people join during the month or so it was up before BF last year and we're hoping to do even more with it this year, so sign up if you haven't.