So we know a couple of things already, based on the segments and precap.What do we know?
Swara will choke on the necklace
Sanskar saw someone other than Maasi in the house, who he is likely correctly think, is Kavita
Kavita and Maasi are in this together
Maasi puts on Janaki's mask and attacks Shomi
Someone puts a doll with broken neck and Swara's photo in Sanskar room
Here is what I think will happen
Sanskar will see the doll and follow the person. He will call out Kavita's name but then see the face. It will be that of Janaki. He will be shocked for a moment before he follows the person. He won't be able to catch them, but will get his hands on something of the person's to prove that it was a human and not ghost.
Same thing will happen at Swara's end.
Swara and Sanskar will talk and hopefully realise that the attacks happened at the same time and the person was human. so conclude that it is two people. They know who but there is no way to prove just yet.
They will try to lay out more plans
In mean time, "Janaki" will also give darshan to Daadi, Ragini and Sujata. the first two to get them to join in blowing the drama and the last one to scare her about apshagun and resist the wedding.
they will keep doing these appearances for most of the functions until the wedding
during the wedding, when they want to make appearance, a third Janaki will scare them hopefully out of their wits (Uttara in disguise joining SwaSan or if Ragini actually wakes up and needs to be redeemed them her)
Both baddies get scared and Maasi blabbers the truth...she will either think the other one is kavita or if she also sees Kavita she will be shit scared.
They will get arrested
SwaSan get married
This is my prediction. What is yours???