The Pennsic War is the largest annual gathering of members of the Society for Creative Anachronism, held every summer at Cooper's Lake Campground in Slippery Rock, Pennsylvania. Two of the Society's 19 kingdoms - the East and the Middle - fight against each other in a variety of battle scenarios and there's a whole collection of other activities from classes to shopping to simple socializing. General attendance at Pennsic War ranges in the 10,000s spanning at least 3 generations and many countries.

For 2 weeks every year Trimarians from all over the kingdom come together to experience the biggest War in the Known World and many of them, not all,  camp in the Royal or the Populace Encampment of the Kingdom of Trimaris.