I will plan on going if things work out. Muscatine is only about 30 river miles and two locks downstream. My plan would be to leave mid afternoon on Thursday and stop at a retired from John Deere friend of mine's place on Andalusia slough Thursday night to drink his beer, and anchor in the slough for the night. I would head to Muscatine on Friday morning. I should be there well before noon if the lock cooperates. Where do you anchor? I assume in the sloughs across from town, but I don't know the depths over there. I would hail you on the radio.
Suprisingly, I have not heard of the event but it looks like fun. If you have time after the event to follow me north after the event I think you could get a free slip at The Isle Capri. I have a car there and get whatever you need in terms of supplies. We have a few exceptional anchorage areas close. First is the LeClaire Canal. It is 200 to 300 yards wide x a mile long. uniformly 15' deep and has no current, clean water and good fishing. The town of LeClaire (birthplace of Buffalo Bill) is a worthwhile stop. It has many antique, gift and specialty shops. It is also home to The American Pickers' original shop. A bit further north (15 miles) are 3 'sand pits' these are dredged for the sand and gravel and connect to the river. Again, clean and no current. The river just gets better and better as you go north. Many interesting towns to visit, less commercial traffic, and more boat facilities.
I hope the June thing works out, will see you there.