On this day in Geography (rather than History)

A new crowd-sourced project.
I've started off a few dates having noticed while teaching the last few months that there were quite a few anniversaries of significant events that link to topics we teach about in Geography at the moment. These included natural disasters, but also events involving cities, the EU and other related topics.
I've filled in a few, and will add more as I get time over the weeks to come, but if you think I've missed something significant which you want to mention then feel free to edit using the link here.