Shemita is related to shabbos. In seven years there are 52 shabosim per year with a total of 7 x 52 = 364 shabosim plus one day left over per year from 365 days generating another shabbos with a total of 365 shabbosim in seven years as explained by the Yismach Moishe. We rest a year from planting to make up for things growing on shabbos. So, Hakhel on Sukkos after shemita emphasizes the holiness of shabbos like Vayakhel does.
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