NanaDana
As a Republican I'll be watching some of the Coronation ceremony purely out of interest in social history, but I feel no allegiance whatsoever to Charles or to any other Royal. The whole concept is a total anachronism, and should be at the very least scaled down to the point where it is no more than a tourist attraction. The Civil List should be abolished, and the so=called Monarchy should play no part whatsoever, even in a ritual sense, in the Government of our Nation. I could say much more about the "worthiness" of the Royal couple, but I'll leave it there. So it's a "No" from me.
Millions around the world will be watching, and enjoying the historical moment in our history. . If your so against it why bother. Just get on with your day. We'll stay with the Kingdoms of Spain, Sweden, Norway, thank-you. A Republic was tried in this country once, it ended well, didn't it. ?
As for the allegiance, nothing wrong with joining in, makes one part of a historical moment. If you don't want to, then don't, it's free choice after all.