noun
special event; one-time event
A loanword from English, used in Japanese for a planned occasion that is out of the ordinary, such as a promotional event, a limited-time gathering, or a unique celebration.
今週末、デパートでスペシャルイベントがあります。
There will be a special event at the department store this weekend.
このコンサートは一度限りのスペシャルイベントです。
This concert is a one-time special event.