@wild couple - i would just plan to have something for each of the nights, neon night the past two times we have been most men wore neon shirts or some sort of neon accessories. my guess is neon new years eve is going to be a bit over the top so maybe that's the one night you do a bit "extra" - at least that's what I'm suggesting to my hubby
the other nights you should be fine, even if they swap the mon/tues around - i would plan for an NYE outfit (neon) and then just something for the other nights listed just in case they are swapped you'll be set.
the gift shop also will sell things related to each theme night but as expected its a bit more pricey than just buying ahead of time.
see you there! (13 day countdown for us!)
A&A