said 8 months, 4 weeks ago:
A few things I’ve used before:
Make a post on the Pages you want to merge asking them to migrate. You can highlight the post to make it more prominent and promote it to make sure more people see it. Stop posting on the Pages you want to merge from so they understand there won’t be additional content posted.
Send out an email blast (if you have a email list) to make sure anyone that doesn’t see it on Facebook will hopefully see it via email. Make sure the info has good visibility within the email.
For a few clients I’ve worked with, we offered a special gift (like 10% off or a free appetizer) which was done through an email sign-up form embedded in the new Facebook Page. it was beneficial in getting business in the door and getting a lot of new email addresses.