Yes they should. Although I believe first there should be a time for grieving and then speeches ect about the persons life follows, and this is where the celebration part should come into it.
Hmmm... 20kgs in a month, I'm about to give it ago so il let you know how I did it. Thats if I succeed. I once lost 7kgs in 6days just eating watermelon and coffee, felt dreadful though because it was summer and I was exercising heaps and working outside... But it was still awesome!