"Hi Hiro, thank you for your interest in our group. Our main purpose is to give Czech speaking people an opportunity to get together and speak Czech. We are a small community. Other than the meetup, some of us have few other opportunities to speak the language. For that reason, we generally discourage non-Czech speakers form joining our group. Having said that, I understand your desire to meet Czech/Slovaks if you're planning to visit Slovakia. If you decide to join us, we will welcome you."