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We also keep schedules of course lectures from past events which can be used as a supplementary guide when viewing archived course videos. We expire older schedules/videos as part of our annual website updates (complete archived videos kept for 2018,2019. Prior to this, we keep archived videos from interactive sessions in our web app (2014-2017) - we have about 6 topics on day 4 as such complete archived schedules for this period aren't required.