If its held on 9/10-11, I plan to attend (this is my first choice for the date).
I hope to attend, and 9/10-11 is as good a weekend as any.
I might be able to attend on 9/10-11, but another weekend would be better.
I can't attend on 9/10-11, but might attend if another date is chosen.
9/10-11 is the only weekend that works for me.
I'll be there regardless (no preference for any particular weekend).