Michelsen Institute from 1986 to 1990, the Bergen International Festival from 1986 to 1987 (and 1989 to 1994 as deputy chairman), the Bergen Philharmonic Orchestra from 1988 to 1990 and 1993 to 1998, Bergen's cinematographer from 1988 to 1990 and Bergens Kunstforening from 1992 to 1996.
•
He was a member of the supervisory board of Bergen Bank from 1988 to 1990, Vital from 1993 to 1999 (chairing this board in 1999), Bergen International Festival from 1994 to 2001, Nera from 1995 to 2004 (chairing it from 1998 to 2004) and DnB NOR from 2000.
During his lifetime, Weidemann's works were shown at Bergen International Festival twice, and was featured at the Venice Biennale in 1967.
ATP International Series | International Monetary Fund | Sundance Film Festival | International Red Cross and Red Crescent Movement | ATP International Series Gold | Bergen | International Space Station | Amnesty International | International Olympic Committee | Cannes Film Festival | BirdLife International | International Finance Corporation | International Organization for Standardization | International Telecommunication Union | International Criminal Court | One Day International | International Nonproprietary Name | International Labour Organization | International Civil Aviation Organization | International Boxing Federation | Toronto International Film Festival | International Atomic Energy Agency | Glastonbury Festival | International Maritime Organization | International Development Association | John F. Kennedy International Airport | Edinburgh Festival | Royal Festival Hall | Venice Film Festival | Los Angeles International Airport |