Hachijojima holds an annual Freesia Festival to celebrate the arrival of spring. The festival began over 40 years ago and today sees over 300,000 freesia plants turn the fields at the bottom of Mount Hachijo Fuji red, yellow, purple, and pink. See here for a detailed schedule of events. While Hachijojima might seem like a long way away, the Izu Islands are still part of Tokyo Metropolis! You can read more about Hachijojima here.
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.