I am still fairly new to hotels/Marriott so please bear with me.

Myself and +1 will be staying at a Marriott in Las Vegas on 7/1 ~ 7/4. However, my companion will get to Vegas before me on 7/1, and I will get there on 7/2. I am also traveling, so I am planning on staying at a Boston Marriott on the night of 7/1 before coming to Vegas on 7/2.

Will Marriott 1. let my companion check herself in on 7/1 in Vegas without me and 2. Will there be any consequences for double booking in different cities on the same day? They will all be reserved under my account / $.

Thanks in advance! Just trying to make sure our 4th of July weekend trip goes smoothly.