Have the extended family over once a year.
Do this once a year, planned in advance. (Hmmm. I wrote this wrong, I probably could have counted this as three items.)
December 23rd 2006 is the first one. That was for Christmas.
September 6th, 2007 is the other. This was for Mom's surprise party. Technically they weren't over at my house, but I did gather them in one place.
I'll still have to do this one more time...