Here is an example of an anecdote - often called a "case study". Because covid spread a certain way at that event does not mean it usually spreads that way.
Most of what we think we know about covid is based on "case studies" like these, which suffer from biases (selection, reporting, memory, etc). Any amount of this knowledge could be all wrong.
Please, next year start doing rigorous covid research, of the same standard expected in other fields. Control groups, blinds, sample sizes, etc, are crucial if we are to gain any knowledge at all about covid, and have any confidence in what we do know.