(22 Jul 2014, 8:54 pm)Tom wrote I don't see why we can put it later on? How about 26th August?

Don't change the dates just to suit a few people - you will still be trying to arrange something by Christmas if you do.
There is always a date that someone can't do.

Go with the date you had in mind and if people want to do it and can do it, pretty sure they will.

If the don't or can't, then that isn't your problem.