No, the term "event" applies only to indoor sports. Pub customers playing a casual game of darts isn't an "event", even if it's taking place in public and there are spectators. An organised darts match or demonstration might be an "event".

I think you are reading far too much into the Act's use of the word 'event' and providing a definition which the Act does not supply.

Like you, I can't see much distinction between customers playing darts or pool for their own amusement, and customers playing music for their own amusement. However the Act does make a distinction. Live music is on the list of regulated entertainment.

You and my local officers may choose to make a distinction between the two activities (or events) but for purposes of determining what is or is not Regulated Entertainment, the Act does not. All the activities listed (including indoor sport) must be treated equally for determining whether they are Regulated Entertainment or not.