From a practical point of view, can I suggest you hold it centred around a weekend - eg. Thurs, Fri, Sat, Sun (with a mid afternoon finish on the Sunday - gives those who travel a chance to get back to work). Minimising time away from work is important for many who are self employed. Unfortunately the bills still have to be paid and astrophotography creates very large bills.
Just my two cents worth.
DT
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