I organize meetups and co-oganize conference in the Czech Republic in https://pehapkari.cz/
I have also experience with speaking at international meetups and conferences. For my references, see:
Tomas loves meeting people with problems, so he founded the PHP community https://pehapkari.cz and maintains a list of world PHP meetups at https://friendsofphp.org. In every meetup and every company he trained, he saw a painful pattern - exponential growth of legacy code.
He also hates doing anything twice. That's why he created Rector, to make every PHP code as if you've started yesterday. He's shared the Rector knowledge in 10 countries and 2 continents.
Some people say it's impossible, but he won't rest until the whole world runs on PHP 8.