There are a variety of ways that someone can say thanks to a speaker at a seminar. A person can say "thanks", or they can mention them in their speech.
It is correct to write it that way. Free is without charge and seminar means there will be discussion.
If you are asking how to say thank you then just go to that person and say thanks and what you are saying thanks for.
What is the sentences we say in the first when we are presenting about Noise pollution a seminar
Hvala = Thanks
No, you would say "Thanks to you".
Thanks you or thanks.
The first thing he does is say yes at the seminar. The first person is the homeless man.
You just say thanks