Les Randonneurs Mondiaux has made an accommodation for the new Challenge Lepertel award in view of this year's COVID-19 pandemic and subsequent cancelling of many RM events. Here is the note on their Challenge Lepertel page.
COVID-19 Note: Many LRM events for 2020 have been canceled. The LRM board has made an adjustment to the award for riders whose first event came in 2019. Those riders need to complete four 1200km or longer events in at least three of the years 2019-2022. (For example - 2019, 2021, 2021, and 2022).
This means that if you rode a grand randonnée in 2019, and are aspiring to the Challenge Lepertel, and didn't complete one in 2020, you'll have to double up and ride two in 2021 or 2022 for your 2019 event to count.