I thought it is an invitation letter to guests, customers. Is it a letter from your business or from Binance?
I don't think it is from Binance definitely so only one chance left, it is from your business. So where is the link of the invitation letter on your website?
Because it is impossible from your business, I move my mind to another option, it is your educational topic to guide newbies creating accounts on centralized exchanges for trading. In this guide, you teach them to open account on Binance.
Binance. How to get started? New user guide
It's worthy to mention Reminder: do not keep your money in online accounts
Bitcoin is only a digital currency or also called as cryptocurrency which is decentralized. He didn't put a link yet to invite anyone about their program because it will not start now but we still have to wait for 1 more month. I guess the OP can still learn more about Bitcoin and hopefully he will improve before the event starts.