What are the biggest events in chess by viewership? I realise chess viewerships have skyrocketed due to organic growth in popularity, and especially due to more people being stuck indoors in the last year.
Are there statistics on how many viewers each chess tournament receives, and if so, what are the biggest chess tournaments by viewership (including online viewers) in recent years?
Please note, this does not answer the question, but I find this information gives some helpful clues. This is twitch daily viewerships of all chess channels combined for the past 5 years. It shows peak and average daily viewers. But it doesn't say what the events were corresponding with the heightened figures.

Source: https://sullygnome.com/game/Chess/1825/summary