L.M.
1. What about the kids creating a video montage. This could be done in a variety of ways - either as a neat slideshow of fun pics of him with friends and family over the years and maybe get childhood photos of him in there, etc. Another way would be as an actual movie type of video where they clip in home movies and do little interviews with people asking fun questions about him, and so forth.
2. As far as dinner party games, here are some good ideas:
http://www.divinedinnerparty.com/icebreaker-games-for-sma...
or google ice breaker games for dinner parties.