That reasoning means that it's intended purpose would be to hurt someone and so that makes it a weapon. I hope you enjoyed the concert and left it home.
I know you already attended that event, but I have one thought about your question. You wanted to know if they would consider your Dec as a weapon. I think you answered the question yourself when you said you wanted it in case you came upon some bad people. Your stated intent for the knife was for protection, that comment says that you already considered your Dec as a weapon, although a defensive weapon. But it is still a weapon in any discussion.
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In hindsight your absolutely right had I brought the knife and been involved in some sort of altercation and during the investigation the police discovered this post, I might have been charged with some sort of intent.
In the end I think the pepper spray option was the right choice. Cheap, moderately effective in creating a little distance if needed.
I’m seriously looking at that belt posted above. I really like a good rugged belt anyway.