Was wondering how this might play out in the end. If you use your phone to monitor your blood glucose, but the venue forces your phone to be locked into a Yondr bag, are there ADA repercussions? Seems that the answer would be “yes”.
An ADA-related consent order: https://www.ada.gov/sfxinc.htm , and this line specifically: “Clear Channel Entertainment agrees not to discriminate against any guest with diabetes with regard to their bringing diabetes related medical equipment or diabetes related food into a concert venue.”
I sent a brief, polite message to the company asking if there is a protocol for this situation. http://overyondr.com/
Obviously, there are back-up strategies like bringing the stand-alone G5 receiver, use a meter, exit the concert to check your Bg, or not to go to the concert at all, but all should be unnecessary as having a phone at your side for monitoring blood glucose is a reasonable accommodation.