You are correct. One of the band went down for knee surgery - don't know if that was a part of why they cancelled out.
And, the $25 per ticket concert / events at Miller Park are now free of charge (as of yesterday).
Go to the HOG website. It's been updated.
Here's the link, but I'm not sure if it will work if you haven't logged in.
https://members.hog.com/website/even...g_25/index.jsp