Ceredigion County Council has terminated a contract with a Lancashire printer after a calendar sent out to residents of the Welsh town omitted details of St David's Day.
The calendar, which detailed other international festivals, such as the Chinese, Islamic and Jewish new years, as well as St Andrew's Day and St George's Day, featured on a leaflet outlining local leisure services.
The council apologised to residents for failing to include the Welsh patron saint's day and has ended its contract with Leisure Information Services.
A spokesperson for the company told printweek.com: "We were given a file to print and we printed it", but declined to comment further.
Gareth Jones, Ceredigion council's director of education, told printweek.com the printer supplied a "blueprint" of what it could produce, which "made it even more confusing" when the calendars arrived.
He added that "it was too early" for the council to decide on a new printer to carry out the work in future.
A council spokesperson said: "We checked other directories produced by the company and St David's Day has been listed in all. This is indeed an error."