YABU. Some people have very busy lives, and don't live 10 minutes walk away from close or extended family.
Last week, me and DH organised what we are doing with our family in December. We are all very busy people, (especially us ones with busy careers,) and most of us live 1-2 hours drive from each other. And a few of the extended family cannot make it Christmas eve, or day, (or boxing day!) due to work commitments (emergency services workers.)
So we have all set a date for the week before Christmas to have a big lunch together (15 of us,) and on Christmas day, most of us won't be seeing the rest, and will stay in our homes, (some with our immediate family, but others just with their partner, as their adult children or parents are unable to meet on Christmas day...)
Christmas is a lovely time (for some) and ideally it would be fab for the whole family (close AND extended) to all get round a table for 15 on Christmas day, like they do in the soap operas, and in films... (at the house of the poor woman who is hosting the whole thing.......and let's not kid ourselves here, it's generally women who do it all!)
However, real life is not like that for some, as some people actually have busy lives and busy careers.
So @keyboardkate it is not unreasonable to plan Christmas get-togethers in late August. Especially if you have a full and busy life. And it is only 13 weeks to December.