The purpose of the meetup is to help non-native speakers of English learn and practice conversational, native English.
If you join this group, you are guaranteed to speak with fluent and native speakers of English. In addition to learning grammar, you will learn how to express yourself very, very naturally. We'll also help you to read and understand advanced materials like the NY Times, The Atlantic, Time Magazine, etc.
You should join if you want good, inexpensive content that will help you improve your language skills. And you will be able to speak comfortably with others without fear of your level of English.