Ni hao, can somebody polish my ad for a language MEET UP?谢谢你！

Since (since when?) we have had more and more language learners join our MEET UP sessions regularly every Saturday. In order to increase the quality and efficiency of your language exchange, you may bring your own learning book or other material and find a one-to-one exchange partner in our MEET UP sessions by forming a small group.

Be very careful with those capital letters. I'm not sure whether MEET UP should even be capitalised, but I'll assume you're treating it as a proper noun.

Therefore, for those who are fixed with have already arranged to talk with one partner, it's not necessary to always be around participate in the larger chatting group.

Again, we would like to offer a beneficial MEET UP experience for all the attendees.

Thank you in advance,

Arena