@Vertigo Hey Vertigo! I'm glad to hear you're still interested. It actually wouldn't be too difficult. I left an in just in case anyone wanted to joined. I briefly had Gin, The Being of Many Names, mention that his has recently spoken to other people as well. So that could mean he's spoken to your character as well. We can play with that to give you an opening.
A few options:
1) You are already in Shimmer town, already at the inn. Already informed. Perhaps even have done some intel.
2) You are already in Shimmer town. Elsewhere in town. You meet up with the main group in the morning.
3) This one is probably less feasible for your character but I have an idea to make it work. But the Being of Many Names (BoMN), has also spoken to the Princess of the Nation of Sight (A post for that is in the works) She has run away and is on a boat. I didn't really plan to have her too involved in the story until after escaping the town, but we can work something out.
4) Retcon: You were with the group the whole time.