You can browse the posts anyday and see all the drama! What really helped us was realizing (and being ok with) the fact that because we chose a DW, not everyone will be there. Some people cant come (money, schedule, etc), some people choose not to.
If there are certain people that you really, really want there, you can plan around their schedules. Otherwise, set the date, be happy, and know you cant control what anyone else does!