Must be A special occasion.

Must be a special occasion.

It was noted that there might be occasions where restitution alone could not provide full reparation.

There might, however, be occasions where restitution alone could not provide full reparation.

There will continue to be occasions when our best efforts at conflict prevention fail.

This meeting should not be an occasion for long statements.

Her birthday happens to be an occasion to celebrate

There have to be some occasions for celebration!

- What's the occasion? - Doesn't have to be an occasion.

Football can also be the occasion of positivegestures.