The aonach (fair or assembly) was one of the great periodic gatherings of Irish society, held at sites of mythological or royal significance and serving simultaneously as market, athletic competition, legal forum, and artistic occasion. Poets, musicians, and storytellers performed at aonach gatherings, and the competitions held there were among the most prestigious in Gaelic culture. The most famous was the Aonach Tailteann, associated with the mythological queen Tailtiu and revived symbolically in the modern Tailteann Games. For Irish poets, the aonach represents the ideal of verse as public, communal, and socially embedded rather than privately meditative.

The aonach was not merely a commercial fair but a vital cultural institution where poets, musicians, and scholars gathered to exchange news, perform, and compete. In poetry, references to the aonach evoke a sense of communal identity and social cohesion that was lost with the decline of Gaelic society. Modern poets often use the aonach as a symbol of lost cultural unity or as a setting for romantic encounters and heroic feats, drawing on its association with freedom, movement, and the temporary suspension of everyday social hierarchies.