One of Tokyo’s most famous hanami spots, Ueno Park boasts about 1,200 trees, half of which are Yoshino Cherry trees. Events are held in the park during this time and stalls set up along the main stretches selling the usual festival fare. See here for a run-down of places to see the cherry blossoms in Tokyo.
Event details are taken from official sources whenever possible. It is always prudent to check the official event website before attending to make sure that there have not been any changes. If you know of an error in the calendar, then please let me know through the contact form.