How to track the global LoL schedule across regions for Worlds

[CharlesM]

I'm trying to plan my viewing schedule for the upcoming League of Legends competitive season, but I'm getting confused with the different regional leagues, international play-in stages, and how they all feed into the major tournaments. I primarily follow the LEC and LCK, but I want to make sure I don't miss key matches from other regions that impact the Worlds qualification. For seasoned esports viewers, what is the best way to track the overall global schedule, and are there particular weeks or events during the split that are considered must-watch due to their implications for the later international standings?