It's a shame that there is a clash, but such is life.
I am sure that there are plenty of shooters who end up with all manner of commitments that mean they can't get to a shoot, or miss something else if they do go.
I haven't seen any others on here moaning because a shoot date doesn't suit them. You attitude is coming across now that you are waiting for a load of people to "join your gang" and start complaining as well, presumably with a view to trying to force a change of date because it does not suit you. I think that fact that there have been a lot of readers and very few comments shows you exactly what people's opinion is, i.e. they don't have a problem with it!!