SELECT "year" FROM table_203_794 WHERE "location" = 'no event'
what was the year in which no event was held ?
CREATE TABLE table_203_794 (
    id number,
    "year" number,
    "location" text,
    "attendance" number,
    "theme phrase" text,
    "top messages" text,
    "host" text,
    "opening general session guest(s)" text,
    "closing general session guest(s)" text,
    "sunday night reception" text,
    "wednesday night party" text,
    "cult shirt" text
)