[2] Sri Lanka Ports Authority Cricket Club were relegated at the end of the previous tournament,[3] with Lankan Cricket Club replacing them in this tournament after they gained promotion from Tier B.

[5] On 16 March 2020, following the conclusion of the group stage fixtures, Sri Lanka Cricket postponed the rest of the tournament due to the COVID-19 pandemic.

[9] After a further delay due to the 2020 Sri Lankan parliamentary elections,[10] the tournament restarted on 10 August 2020.

[11] Moors Sports Club won the Plate League,[12] and Colombo Cricket Club retained their title, with an unassailable lead ahead of the final round of Super Eight matches.

[13] In the final round of matches, Dinesh Chandimal scored 354 not out, batting for Sri Lanka Army Sports Club.