Volunteering opportunities for the Czech Republic, free archive.
Here you can find volunteer programs available in the Czech Republic.
When you consult the announcement don’t forget to check the dates to see if the description is up to date.
To get in contact with the host, look for the “contact details section“: there you can usually find the e-mail and other relevant information to open a communication with the host/organization or local community.
If the announcement is old, you can still try to see if the opportunity is available by sending the hosts a message.