1955 | Clevention (WorldCon)(as a fan) | Cleveland, Oh. |
1965 | Balticon 1 (Major Financial Underwriter) | Baltimore, Md. |
1966 | Disclave (Guest of Honor) | Washington, D.C. |
1967 | Lunacon | NY, NY |
1968 | BayCon (WorldCon) | Oakland, Ca. |
1969 | Fan Fair I (Guest of Honor) | Toronto, Canada |
1974 | Worldcon 1974 (Guest of Honor) | Washington, D.C. |
1977 | Roc*Kon 1 | Little Rock, Arkansas |
| SunCon (WorldCon) | Florida |
| City Council dinner/reception with PKD, John Brunner, Harry Harrison, Robert Sheckley and Harlan Ellison | Metz, France |
1978 | Unicon IV | Australia |
1979 | UrCon 1 (Guest of Honor) | University of Rochester |
| Disclave 79 (Guest of Honor) (May 25-28) | Washington, D.C. |
1980 | V-Con 8 (Guest of Honor) (May 23-25) | Delta, British Columbia, Canada |
| Minicon of some sort | Texas A&M University |
| Westercon (Guest of Honor) | Los Angeles, CA. |
| Rivercon V | Louisville, KY. |
1981 | Bubonicon 13 (Guest of Honor) | Albuquerque, N.M. |
1982 | Aggiecon 13 | Texas A&M University |
| Congestion (NOSFA 1982) |
1985 | 7th Annual Eaton Conference on Fantasy and Science Fiction | UC - Riverside |
1986 | Per Ardua Ad Astra (Guest of Honor) | Toronto |
| Dallas Fantasy Fair (July 4-6) | Dallas, Tx. |
| JAFCON (Oct 3-5) | Salt Lake City, Ut. |
1987 | Balticon 21 (Guest of Honor) | Baltimore |
1989 | Lunacon (Guest of Honor) | Rye Brook, N.Y. |
1990 | Norwescon XII (Guest of Honor) | Tacoma, Wa. |
1991 | MOC 6 (March 1991) | Greenville, S.C. |
| Rovacon (Oct 2-3) | Lynchburg College, Va. |
1992 | Conduit (Guest of Honor) | Salt Lake City, Utah |
| I-Con XI (Apr 3-5) | Stonybrook University, N.Y. |
| MARCON 27 (May 22-25) | Columbus, Oh. |
| CopperCon 12 (Guest of Honor) (Sep 10-13) | Phoenix, Az. |
| Con-Cept (Guest of Honor)(October 17-18) | Stonybrook University, N.Y. |
1993 | 1993 World Fantasy Convention | Bloomington, Mn |
| Archon 17 (Toastmaster)(June 25-27) | St. Louis, Mo. |
| Loscon 20 (Guest of Honor)(November 26-28) | Burbank, Ca. |
| Lunicon 14 | Leeds University |
| Kaleidoscope 1 (Guest of Honor) | Lynchburg, Virginia |
| Rustycon X (Guest of Honor)(Jan 15 - 17) | Sea-Tac, Wa. |
| Fourth Street Fantasy Convention | Minneapolis, Mn. |
1994 | Life, the Universe, and Everything XII | Provo, Utah |
| ICFA |
| Miscon 9 | Missoula, Montana |
1995 | Conquest | Victoria, Australia |
| Cybercon 5 | Colorado State University |
| DemiCon VI (Guest of Honor) | Des Moines, IA. |
| Silvercon 4 (he passed away before this one) | Las Vegas, NV |
| GenCon (Guest of Honor) (he passed away before this one) | Lake Geneva, WI. |
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