MGM Rewards - Multiple trips

Hey guys,

I'm heading to Vegas in September for a few days and have booked comped nights at NYNY via my Mlife/MGMRewards offer. I have now also been invited on another trip down there either in January or February, so I'm wondering....am I able to book two trips at once with the offers being shown to me currently? If I look at those months I'm still seeing comp nights available, even though I have my other trip booked already. Or should I be waiting until I get back in September for my new offer to appear?

Cheers!