I would definitely book NOW! The rates for airfare will only increase!
march is definitely HIGH season for Mexico. It starts teetering into the low season as hurricane season approaches. I would definitely work with a travel agent if you have the chance to. It is great to have your guests contact the TA with any questions so that you are free to plan all the special details. We are getting married at DRC April 2, 2011 and have 48 guests booked, and counting! Wahoooot, we are sooooooooo excited!