The Venice Biennale is one of the most important contemporary art events in the world, held in odd-numbered years from late April through late November. The main exhibition venues are the Giardini della Biennale (home to 29 permanent national pavilions) and the Arsenale, a sprawling former shipyard converted into gallery space. Dozens of additional national pavilions and collateral events are scattered across the city in palazzi, churches, and warehouses. A single-venue ticket costs 25 EUR, while a combined Giardini-plus-Arsenale ticket is 35 EUR (reduced rates for students and seniors). The opening week in late April is the busiest, drawing collectors, curators, and press from around the world. For a calmer visit, come in September or October when crowds thin considerably. Budget at least a full day to see both main venues properly.