Odd question. I think I want to go to Vegas sometime in the first or second week in June. Because of work, I'll probably end up booking my flight the day of or the night before. I'll probably stay about 5 nights at some combination of M, Cosmo, Venetian, and Mandalay with a trip to national parks for a couple days sandwiched in. I have comp offers at all these places, and have stayed at them all several times on comps several times before, but am not someone the casinos are going to go out of their way for. Any idea how long in advance I would need to book to make it likely that I'll be able to book comped rooms? I'm hoping a few days will suffice. I guess this question might boil down to "how busy is Vegas in early June," but maybe there's more to it than that. I'd rather not get into the game of cancelling and rebooking 100s of times or staying at lower-tiered CET properties if I can avoid it. Thanks!!