oh i actually found some update from yesterday:
https://riotwatch.gg/posts/valorant/e-sports/2782/masters-madrid-ticket-and-venue-policies
quotes:
Will there be food services? What are the payment methods?
Yes, food and beverages will be sold at the event. For alcohol sales, there will be an ID check at the security check for 16+ and 18+ wristbands. The event will be cashless - it will be possible to pay with Credit/Debit Cards. (ELO and AMEX won’t be supported).
and unfortonetly no re entry wow:
No reentry - attendees will not be able to enter the arena again with the same ticket if they leave.