Hey man,
I live in Vegas and offer a few things to consider.
1. You will not be allowed into a Casino in full Fett gear. If you try it will result in being tackled by security and a visit with Metro Cops. That have zero humor about helmets and so forth in Casinos. It has to do with the NV gaming regs.
2. Halloween can still be in the 90's back here make sure to pack your Fett with fans.
3. Metro will not tolerate Trooping with weapons on the street. I have known of a couple cases were guys were told put them in cars or go home. The rest of you gear no worries it's the weapons they get nervous about.
Fremont street and the arts district are fun places to troop on Halloween. The main is huge and tripping it can be fun but very crowded.
Come enjoy and hope you have a good time.