Casual clipped form of イベント, used in informal conversation and online contexts.
See also: イベント
週末のイベ、楽しみだね。
I'm looking forward to the event this weekend.
次のイベはいつ？
When is the next event?
I'm planning to go to the event this time.
来月イベを開催する。
We're holding an event next month.
There's a big event this weekend.