Atlassian is an Australian software company. In 2005, they began holding internal innovation days that became a popular example of the 'hackday' concept. These 'Days' were named after a company in an unrelated business area, because the whole concept had to be conceptualised, created, and coded in a day.
In May 2012, the other company, though flattered, asked Atlassian to stop using this name.
Which is this other company?
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Fedex. The reason these were called "Fedex Days" was because the idea was to 'ship' in a day.
Read more about this here.