By now the expected full blossom has passed, but the practice of hanami, cherry blossom viewing parties, has been around since the 8th century Nara period in Japan. Originally designed for viewing ume, plum blossoms, the practice shifted to viewing sakura, cherry blossoms, in the Heian period in the 8th thru 12th centuries. With shelter-in-place in effect, some websites are hosting virtual hanami.
Sources: The Art of the Cherry Tree by Mizue Sawano [Sawano, M. (2006). The Art of the Cherry Tree. Brooklyn Botanic Garden. https://books.google.com/books?id=nHf8lxLOYsUC&pg=PA12&dq=Hanami+nara#v=onepage&q=Hanami%20nara&f=false ], The Times, Library of Congress
Image Source: Wikimedia Commons (GNU Free Documentation License)
Virtual Hanami: Stars and Stripes Japan