I’m all caught up now and baffled by a lot of the flash forward, which I suppose is the point.
My first theory was -
Max has a one-night bunk-up with Priya, probably after she has a row with Ravi over his continued involvement in drug deals. She gets pregnant.
In the meantime, before the pregnancy is revealed, Max gets involved with some dodgy business with Ravi and starts a proper relationship with someone (Chelsea?) and they are getting married on NY Day.
Pregnancy is revealed at Christmas - either around the table as Christmas dinner is served, or at the Vic in front of everyone (obvs).
Chelsea forgives Max as they weren’t together when he had it away with Priya. But Ravi goes MAD and kicks Priya out (hence her sleeping in Max’s bed - he couldn’t leave his ‘babymum-to-be’ out on the street, even on the eve of his wedding).
Ravi then decides to get revenge on Max by fitting him up (no ideas yet about who he is meant to have been conspiring to murder) and kidnapping Lauren & Oscar.
I agree with previous posters, though. The whole thing is probably one big red herring fest, and it’ll turn out to be all just a dream drunk Kathy had after one lambruni too many!