Trying to decide what to use points for a September trip and this is the first time redeeming. It is complicated because we are traveling with others and they are not MyVegas players so I am not sure how the timing of things will work out. If I purchase a buffet pass at what point is it too late to cancel and get the points back? I assume I am OK until I go to the mlife desk to get the buffet voucher? How about if I get show tickets?