Looking for a social media group to get notified of all upcoming olympiads and competitions

So recently, I've participated in a case solving competition...this was my first time in such a event and had a blast!!!...Though I didn't secure any position...but It boosted my confidence a lot and I learned a lot..now I want to take on more challenges and get gud :3

So what I'm asking for is a group that announces all the upcoming competitions...I'm into case solving, programming, robotics...I'm willing to try mathematics and other fields too(vatari :3 but I wanna explore various fields and find out where my interest lies strongest)...

I’d prefer a single group, rather than multiple, that shares announcements for all kinds of competitions for specific subjects—like a programming group that announces all upcoming programming contests. Something like that...