That's a shame. I've always wanted to come, but June never seems to work. As others have said, family and work obligations must be your first priority. Organizing what seems to have been a very successful event in the past, I'm sure, has taken it's toll, and if keeping it going when it's becoming harder for people to come doesn't make sense for you, then canceling is better than finding yourself in a frustrating (and perhaps costly) situation. Maybe it's best to plan for it every other year, anyway? Don't know, but if you think about it for next year, perhaps it will be June I can make it!! If not, I hope our paths will cross at some other photo party, Bill.
Best wishes to you and your family.