Presumably this year will be out west since the musters usually alternate years east-west. Shiloh, Vicksburg, Chickamauga, and Stones River & Franklin have already been covered, I think?
The other big question is what battlefield has someone who can step up as lead organizer. Wilson's Creek / Pea Ridge / Prairie Grove would be a great idea but I don't think anyone from CWT lives close enough to organize it.
IIRC, there was some strong interest in Charleston & Savannah last year. That is arguably Western Theater, by some definitions.
Mobile & Pensacola could be interesting, and probably one of the less expensive options.
The Overland Campaign and the Petersburg Campaign are probably the most prominent possibilities in the east.
The Maryland Lighthouse Challenge got postponed again so that opens up my fall vacation plans. Depending where the muster is I might attend.