These are the places I have found quilting groups in my area in the past 5 years:
1. on the bulletin board at the library itself and mention it to the staff who checks out the books - if they notice quilt books magazines being checked out, perhaps they'd let the customer know about your meeting there.
2. In the local newspaper's Community News or weekend events section. Sometimes these announcements can be placed online.
3. See if your local guild allows a "public service" type announcement in their newsletter where you could mention the dates and times. Or will they allow "bookmark-type" flyers to be passed out at their meetings.
4. Sometimes local Craigslist has announcements for local groups.
Jan in VA