Along with @anigbrowl in the comment above there are really three main types of audience: bands, fans and venues/promoters.
One of the possibilities is to charge for stats, how many visits, where are they coming from etc. But I think this is only possible with a larger visitor base (i.e. more unique visitors/hits).
I really like your idea for resources for touring, this could be a good thing to go for, especially as it is all about helping the artists (which is primarily what the blog focuses on). The yelp idea is great as well, and fits in nicely.
But again it's how to make a return on these resource, is advertising the only way?
Edit: after going through anigbrowl's comment above and thinking some more, these resources will be a great way to help promote a band and build up a fan base. Then hopefully we have some value here to the venues by helping them find bands that will bring in the public. This is good stuff. Thanks