Try to obtain free meeting space at a local church, synagogue, library, community center, hospital or social service agency. The facilities should be barrier free. If you anticipate a small group and feel more comfortable with the idea, consider initial meetings in members' homes. Most prefer weeknights. It is easier for people to remember the meeting time if it's a regular day of the week or month, like the second Thursday of the month, etc.
Some people like to have the meeting around an informal supper, such as a potluck.
A few even have meetings at a diner or restaurant. Publicizing and Running your first Meeting. Reaching potential members is never easy. Consider where people with sarcoidosis would go. Flyers in post offices, hospitals, and libraries may help.