Since I preapprove buyers, it's also important for me to point them to the right referral partner be that a builder or realtor.
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Normally when I attend a broker's tour it is to identify potential homes for an active buyer that I am working with. Lunch is always nice for a broker's tour, but I am not sure that you need to do anything more than that. The agents that have active buyers looking in that price point, will come and view the home if their schedule allows. As you can see from my other post, buyers in this price range are pretty few and far between at this time.
It's a strong buyer's market right now. I would encourage you to focus on having the best home at the best price to get it sold!
Maybe have a pretty basic broker's tour to start and see what happens. Depending on the turn out, you can see if doing something more will make sense.