Working on a Carnival adventure and need some help

So I've started two new groups that I'll be DMing; for one of these groups I'm running Wild Beyond the Witchlight and I thought it would be a fun idea to have the second group be an inverse of the first by having them show up at Ravenloft's Carnival domain. Now, I have a few ideas for having it all take place in the carnival itself, but I'm worried having multiple sessions in the same place might get a bit old. Since WBTW has the characters leave the carnival to go to the Feywild, I figured I could do something similar with another location in Ravenloft: Tepest. Thematically, it makes sense to me since Prismeer has been taken over by hags and Tepest is being controlled by one, but I'm unsure of how to enact the transition. I thought maybe the Caller showed up in Tepest and maybe he contributed to Lorinda's desire for a child in some way. If not that, maybe the Carnival is having some effect on the Tithe.

Could these two mesh? I just think there's more in common with the Domains than not.