Lommy's handy list of attracting Barrow-Downers to your home city/country
1) Convert all your friends and family to Barrow-Downers. This way, the ones you seek to lure to your lair are attracted by not only the thought of meeting just one lovely person, but many lovely people.
2) Invite people personally and tell them you'd love them to come. Also, give them good reasons why they'd want to come.
3) Once you manage to lure one person, it becomes easier to lure others to come too. Downers get jealous easily...
These tactics have proven succesful...
