"unexpected occasion" is a correct and usable phrase in written English.
You can use it to describe a situation that was not planned or expected. For example, "We had to quickly reorganize our plans when an unexpected occasion presented itself."
This meal, before we went home, was one of those unexpected occasions where everything is right.
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We remember a vivid person, a remark, a sight that was unexpected, an occasion on which we felt something profoundly.
Of course, replacing the iconic O'Driscoll will heap the pressure on the New Zealand-born Irish debutant but I don't expect him to play in an inhibited way and in fact will be surprised if he doesn't attempt the unexpected on occasions in Saturday's opening autumn Test.
Such trends may be leveraged to design systems with reduced long term lifecycle costs and, on occasion, unexpected benefits.
War could have been averted, not by German restraint, but only by a humiliating Austrian withdrawal never the Habsburg way.War had not been unexpected, but the occasion and timing were.
But sometimes, unexpected windfalls, happy occasions or just plain thankfulness prompt people to remember New York City's poor during gentler seasons.
And whatever the insistence by the visiting camp that Fielding can bring unexpected skills to the occasion – much as Fury did against Wilder – there is an obvious gap in their history and achievements.
