I am having a hard time keeping up with recent tournaments. Are there any good online calendars?
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Depending on quite what you mean by "keeping up", you may find the app Follow Chess helpful. – Steve Lovell May 18 '20 at 13:52
Here's a link to the fide calendar: https://www.fide.com/calendar
Also, this link includes the tournaments which will feature some of the top super GMs (e.g., the Olympiad, Sinquefield Cup, Altibox Norway Chess): https://chess24.com/en/read/news/2020-chess-calendar