I'm not sure how things are done in the USA -but here in the UK I'd put information about the group on notice boards such as in local libraries and shops . I'd also put an ad about it in the local newspaper.
You might also find magazines and websites which are targeted at "New Age" spirituality/mysticism/paganism/self-help. Some of them may make you
but the people who may be interested in what you do are probably amongst their readers.