I'd honestly be interested to hear more, if you're willing to share. PM me please?
It started with new players, so we had a simple plot in the beginning: pending war, army growing, and the PCs getting caught in it. Then, we wanted to do Mines of Phandelver, so we worked into that and played through it. After, one of the villains from the premade had survived and went on to cause further havoc for the PCs. They were accused of murdering some of the NPCs from Phandelver, and they went on a quest to clear their names. During which, they accidentally stepped through a shadow portal into Shadowfell. They didn't know where they were or what was going on for a while, but they weren't too happy to be there (the shadowfell rules in the DMG are great fun). They all sort of became corrupted in one way or another before they made a deal with a Vampire Lord to secure their exit from the plane. Part of the deal was that they had to go to another plane to help defeat one of the Vampire Lord's rivals. The other plane was my own variant of Dark Sun - the players weren't too happy about being there either One of the PCs had died back in Shadowfell, so his body was traded to some Thri-kreen for water. After travelling through a slave city and lots of sand, they finally completed their objective. The goodly cleric in the group had acquired an evil tome that held secrets to planar travel, which he was finally able to understand and complete the ritual needed to get them back to Faerun. However, they arrived back in the jungles of Chult. After some more wandering, they secured passage on a ship to get back. On their return, they discovered that the pending war from so long ago was already lost, and they had a villain to overthrow.
in total, the players went from the Sword Coast, to Shadowfell, to Dark Sun, to Chult, over the ocean, and finally back to the Sword Coast.