Most casinos will ask you at the registration step if you want to get emails from them. Tick the box or click ‘Yes’ to communications. If you haven’t done it at the beginning, you can go to your account settings and accept the promotional emails. This is how you subscribe to the latest casino promotions, including tournaments.
https://casinobest.ca/faq/how-can-i-subscribe-to-a-casinos-email-communications/