Some Persian texts from the 10th and 11th centuries report with regard to Jamshid, the mythical first king of Iran, that Nowruz was considered t he most propitious time for the coronation of kings. During the seventh century, the Sogdians (as other Iranian and non-Iranians peoples in general) celebrated Nowruz in the summer. The southern wall bears a mural that seems to show part of the Nowruz festival dedicated to the fravashi (often rendered as “soul”) of all dead: the Fravardigan or “all saints festivity” which is currently still celebrated in Iran.
You can learn more about the topic in the book-album "Sogdia: the Heart of the Silk Road" (XXXV volume) in the series "Cultural Legacy of Uzbekistan in the World Collections".
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