I am trying to set up an announcement list for a local non-profit film festival.

The list may contain subscribers from all over the planet requesting information, etc. Additionally, there will be the local citizens who need to get general information as well as announcements of up coming events. And finally, there will be management, staff and volunteers.
I would like to be able to 'filter' mailings. For instance, when we have a local screening, I only want to send the announcement to local people. Is there a facility in Mailman to create sub-lists or filter on a master list? I could set up multiple lists but then I would have to synchronize them in that it is possible that a subscriber could be in multiple categories.

Thank you in advance for any help you may give me.

Regards, Bob Bob@RChaput.com