Advance sales of admission tickets for the 2025 Osaka Kansai Japan Expo began on Thursday, 500 days before the global event in western Japan is set to open, amid lingering concerns over ballooning costs.

The Japan Association for the 2025 World Exposition aims to cover most of the operational costs through admission fees, setting a sales target of 23 million tickets for the event that will run from April 13 through Oct. 13.

The organizer hopes that 14 million tickets, or about 60% of the sales target, will be sold in advance.