At what establishment did the deadliest fire in Ireland take place at? 
Carrickmines fire:  This was the country's deadliest such disaster since the Stardust fire. Stardust fire: The Stardust fire was a fatal fire which took place at the Stardust nightclub in Artane, Dublin, Ireland in the early hours of 14 February (Valentine's Day) 1981.
Stardust nightclub