The term "Bouchercon XXI" does not correspond to a widely recognized or documented event based on available reliable sources. Bouchercon is an annual fan convention dedicated to mystery and detective fiction, traditionally named with consecutive Roman numerals indicating the year of the event. "XXI" denotes the number 21, suggesting this would refer to the 21st annual Bouchercon, which would have taken place in 1990.
However, accurate information about a specific event named "Bouchercon XXI" including its location, dates, guests of honor, or programming is not confirmed in accessible and authoritative records. While Bouchercon has a long-standing history beginning in the 1980s, detailed archival documentation for early conventions may be limited.
Without verifiable details, "Bouchercon XXI" cannot be definitively described as a formally recognized occurrence within established encyclopedic sources. The term may appear in niche references, fan accounts, or informal contexts, but it lacks sufficient documentation for inclusion as an established concept in standard reference works.
Etymologically, the name combines "Boucher," a reference to crime fiction critic Anthony Boucher, and "con," short for convention, following the naming convention of prior events.