April 26-28, 2024
United States Possessions Philatelic Society
Royal Philatelic Society, London
Colombia Panama Philatelic Study Group
Canal Zone Study Group
April 25-27, 2025
American Helvetia Philatelic Society
Rossica Society of Russian Philately
MEPSI
Rhodesian Study Circle
April 24-26, 2026
April 23-25, 2027
Military Postal History Societ
American Society of Polar Philatelists
Information on becoming a guest society at WESTPEX can be found here.
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