MOS is a comprehensive international trade and business fair held in Celje, Slovenia, and remains one of the region's major annual trade fair events. The 2026 edition continues to connect exhibitors, business visitors, and the wider public through commerce, innovation, and product discovery.

The fair is structured around two main pillars, MOS Living and MOS Business Opportunities, covering sustainable living, construction and renovation, energy efficiency, smart homes, environmentally friendly materials, tourism and consumer offer, as well as industrial solutions, digital services, innovation, entrepreneurship, and international networking.

MOS is the largest trade and business fair event in the region, with a recurring scale of more than 50,000 visitors, 650 exhibitors, and participation from 20 countries, making it a strong platform for regional market access, sourcing, and cross-sector business exchange.