Well, I have more info

if nobody else does

I called the "pizza runner" today and got more information on the Harmonica Army: They say that, yes, it is a Lindquist field; they will be going for the record at about 5 p.m. but the will be registering people and distrubuting harmonicas from about 3 pm. If you bring your own harmonica, make sure it's in the key of A. Tell everyone you know - this is a crazy, once-in-a-blue-moon kind of an activity! So I will see you all at Lindquist field around 3 on Saturday. You will know me by my pointy hat.