About Exhibition The Big 5 Construct South Africa 2026 will be held from 10th - 12th June 2026 at Gallagher Convention Centre in Johannesburg, Gauteng, South Africa. This is a leading trade exhibition and expo, connecting the construction industry in South Africa. It is a showcase of global products, technology, and innovation that will service this rapidly growing economy driven by significant government investment. It will provide ample opportunities for attendees to connect with industry professionals, government officials, and potential business partners.