Last weekend's event was unique, though: they gave out faux hurley balls. The balls aren't really usable -- they're much too light and soft to actually play with. But they turn out to be far more useful for all that, because they turn out to make most excellent cat toys.
Merlin is currently raising quite a racket, since the ball keeps getting caught in his claws and going flying. Haven't actually seen a cat toy get him this worked up in ages...