The other issue to remember is the people who are in the middle and have a choice will likely go to the events with more people. This was also proven before. I would try to get a list of only those who can NOT participate in regular events, this will give a better idea of what the participation will actually be. Not trying to be a bubble burster, just want to make sure this doesn't turn out the same way it did last time with several races with no sign ups.
So assume that you will have entirely different race times. Moving the race slightly will only exclude people who are currently able to participate. Rather than listing the latest you can race, just give a range of times which are ideal. We will find the happy medium that will work for (hopefully) everyone on the east coast (or anyone else who can not race with current times), so that we can get everyone racing without sacrificing current regulars.
So assume that you will have entirely different race times. Moving the race slightly will only exclude people who are currently able to participate. Rather than listing the latest you can race, just give a range of times which are ideal. We will find the happy medium that will work for (hopefully) everyone on the east coast (or anyone else who can not race with current times), so that we can get everyone racing without sacrificing current regulars.