You send an advertising post to your acquaintances and friends (you can also publish information on social networks, or shoot reels-stories-shorts). Give them the link ihappy.site and your unique promo code* (several Latin letters and/or numbers).
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*If you want an additional consolidation and control, you may not publish your promo code in the public domain, but instead invite people to write to you in a private message to book a place. And then you can give them a promo code in exchange for their contact information: Telegram login, full name, phone number, email. All this data can also be sent to our manager by email along with your promo code, so that the commission is accrued with double consolidation: by promo code and by contact information. After the retreat is over, you can write personally to everybody you invited and ask if they liked the retreat. That’s certainly the most reliable consolidation))