I don't know if we have more information on a Dylan/Ellie storyline, probably as you say it's not like Emma's route that ends Dylan/Sophia (according to the walkthrough) but it will have different content while Dylan/Sophia still goes on.
But still I wonder what are the conditions for having the 3 events, given that afaik so far Dylan/Ellie is not optional (there are no choices), the only thing is the FW route as I reported in the last message. Probably we will know better with this update or with the other event at noon PD 13 where some choices maybe will be left to the player.
Even blackmailers have the right to rest on weekends
On a different topic: we were saying that Andy and Cathy will ask Sophia and Liam to be the maid of honour/best man, well apparently it has happened already, I didn't pay attention to this short exchange.
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Concerning the wedding there are left the bachelor(ette) parties to organize and/or the wedding reception, like they ask to use their house for the ceremony and/or the party after that. Assuming that they are going to get married in San Alejo, not their hometown (they are on vacation), I guess there won't be a lot of people attending.
Obviously it could be something else not related to the wedding as well (cannot have children etc)