We had a discussion a few years back about the time of year of First Communions. Most agreed that they usually take place in May, but some argued that it could also take place at other times of the year.

As far as the water skiers in Tahoe (in November)... well, that's another story.

I think FFC just took poetic license and tried to show how the family was getting together for another joyous celebration (like Connie's wedding in Part I) but showing how the family had changed (there was no real warmth at Anthony's party)... a theme he (FFC) tried to show all throughout Part II.