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Since you describe it as coming from "up front", and it's not obvious from visual inspection, I would suspect something loose inside the headlight housing.
I actually thought it might be the horn grill, so I stuck some RTV in there to mute that. It wasn't. Headlight is aftermarket, and I don't think anything in there can rattle, but that would be nice to find when I check it. Front fender area checks out. I'm not used to hearing anything up there, so it's really bugging me, as little things tend to lead to bigger things, and Elkader is this weekend.
Agreed, but the worst thing I can think of in your situation is a loose timing chain, and it will happily grind on the case for thousands of miles without failure. All the others are just an annoyance. Take candy to throw to the kids in the parade.