Plural error or set phrase? -- a Games for everyone
This job ad posted by the London 2012 Organising Committee ends with the sentence:
London 2012 is a Games for everyone, so we want you to apply regardless of your age, gender, ethnicity, sexual orientation, faith or disability.
Is "a Games" a set phrase?
It's neither a 'set phrase' nor an error. It's just a creative and potentially attention-grabbing short form for The Olympic Games (or An Olympic Games if you want to nit-pick, but I'm sure the guy who wrote that was pefectly happy with his work).