Anyone aged 18 and over will be required to show proof they have been vaccinated against COVID-19 or have a valid negative PCR test to be granted entry into Dubai Expo 2020, its organizers said on Wednesday.

A negative PCR test must be taken within 72 hours to be valid, according to the organizers.

Non-vaccinated visitors will be able to take a PCR test at a facility adjacent to the Expo 2020 site. Testing centers have also been set up across the emirate and can be found on the Expo 2020 website.

Anyone who presents a valid ticket or day pass at any of the centers across Dubai will not be charged for their PCR test, the organizers said.

The United Arab Emirates is expected to welcome 25 million visitors over the next six months in the largest cultural gathering since the COVID-19 outbreak. The pandemic had forced organizers to push back the event for a year, putting a huge dent on the country’s economy that relies heavily on international commerce and finance.

“By updating our vaccination and testing requirements, we are opening up a world of discovery and education for every visitor from every corner of the planet, enabling the world to experience Expo 2020’s incredible offering in a safe and secure manner,” the United Arab Emirates’ Minister of State for International Cooperation and Director General of Expo 2020 Dubai Reem al-Hashimi said in a statement.

Expo 2020 Dubai, which will begin on October 1, is set to be the world’s biggest cultural gathering, with more than 60 live events every day and hundreds of cultural and culinary experiences for 182 consecutive days.

The exhibition, expected to attract 25 million visits over six months, will still require people to keep their masks on and respect social distancing rules.