Two of them may even get together for the rare social occasion.

Perhaps, on rare occasions, it was possible for two people to fall and stay in love.

You will only want to do this on rare occasions.

On the rare occasions the subject comes up, all people seem to talk about is the need to be needed.

On rare occasions, the Museum may close for a special event.

This is one of those rare occasions when in fact you can do both.

And on what rare occasions does he think of himself as one?

It's a rare occasion when they're called upon to do anything.

On rare occasions, they may continue for up to two days.

It was a special moment, a rare occasion to see them walking.