Look for other meetups groups to co-host your event? Checkout the new market place by community organizers!
The community organizer group to is open for everybody to suggest a meetup for this group who are looking for co-host organizers. Then other community organizers can use this to promote with each other.
So, if you would like to your meetup to be co-hosted with other meetups groups, please post here:
Other organizers of the group can just copy the desc to their meetup to create an event.
Its still in beta, but worth to try!