Silver vs Plat (5v5s) Is this still a thing?

Hey! I recently had a game and my team mates and I started talking and I mentioned how I can't seem to find higher skilled people than me to play against. The person mentioned that there was a Silver vs Plat teams going on, but I forgot to ask him how that thing works. He did mention that "They" do not accept randoms anymore because trolls started showing up. There seemed to have been a chat room of some sort for that. I was wondering if someone could help me out. How can I contact "them" or at least ask if I can participate in a way. P.S. I'm a silver scrub by the way. Any help is appreciated.
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