Marriott changed how it denominated weeks part way through this project.
At the outset, Marriott sold only week 52 as an event week; all other weeks were sold as floating 1-51. Weeks deeded in Hales (Buildings) 1-3 were sold in this fashion.
Marriott then changed to selling both week 51 and week 52 as event weeks; remaining weeks were sold as 1-50 floaters. Weeks deeded in Hales 4-8 were sold such.
Whether the week floats 1-50 or 1-51 doesn't seem to affect resale price. So buy something deeded to Hale 1-3 to give yourself the option to reserve week 51.
Note: Hales 1-3 contain both ocean view and island view units.