We could take a straw poll of dates to ensure that the most people can come.
Yehbut -- one of the reasons that the PaddyWaP was held when it was, was becos I took a straw poll.
Most everyone said, "don't matter - I'll come if I can whenever it is." Two people said, "It has to be in the end part of June - that's the only time I can come."
So, we set in at the end of June. Neither of those two people came.
They had extremely good reasons why they weren't able to make it, which came up after they had said when they were available. But the same happened to a couple of people who ha\d said they'd like to come and hadn't specified a date.
The moral of all this long-winded guff is:
It doesn't matter when you set the date - some will come, some won't. So set the date to fit the weather and we'll all do our best to get there.
And, fwiw, I've always wanted to go to SF, whreas LA doesn;t attract me at all, at all. 
