This is the closest I could find.
Quote:
1.5.3 The Administrator may, in his/her absolute discretion, amend the composition of the Championship at any stage of the season and will give as much notice as possible through the issuing of a Bulletin to all competitors. The number of Rounds will not be increased without consultation with all competitors.
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That clause has already been used this year with the revised calendar. If one or more rounds are lost to a further lockdown then I guess they just apply it again and run over a reduced number of rounds. There is no Duckworth–Lewis style calculation