Hello Carolena, welcome to the Disney Parks Mom's Panel!
January is a great month to visit Walt Disney World and enjoy nice weather and low to moderate crowds on most days.
Disney marathons usually have very little effect on park crowd levels and by the time you arrive
Walt Disney World Marathon Weekend will be over. During the weekend of Martin Luther King Day (January 20 2014) crowd levels are usually higher than the rest of the week.
At the moment, there are no special events scheduled for the time of your visit. Check
Disney's Calendar for park hours and event times.
Thank you for visiting and letting us help you plan a magical Disney vacation.
Hope to hear again from you.
Miguel