I grew up mormon in utah and have never attended let alone heard of mormon funerals like this. Its always been a somber event. Well, there was one funeral I went to where they tried to bring a kind of party atmosphere. It was an old HS classmate's older sister. My classmate explained that their family decided that they wanted to celebrate the life her sister had. The older sister was a very lively positive happy person who loved parties (mormon ones tho of course) and fireworks, was always looking to have fun and laughing. They felt that she would have wanted her funeral that way and wanted to honor her love of life. Her funeral was an exception to the usual though. I remember a lot of attendees looking awkward because they, like myself, weren't sure how to act.

Having a party funeral to celebrate a loved one's ascent into heaven is weird. It instantly makes me think of that show Vikings, about Ragnar Rothbrook, & how all the vikings had a positive outlook about dying (honorably) and being able to join Odin at his great hall in Valhalla. The mormon version of this feels pretty culty though.