(Image credit: Obama for America)

DENVER - As the clock ticks down to tonight's debate, President Obama will enjoy some down time at his local hotel and the first opportunity to see his wife Michelle on their 20 th wedding anniversary.

The president, arriving from Las Vegas, will reunite at the hotel with Mrs. Obama, who is coming in from Reno, campaign aides tell ABC News. The first lady did not attend her husband's intensive three-day debate camp in Henderson, Nev.

Michelle Obama told the ladies of ABC's "The View" last month that she plans to formally celebrate the marriage milestone with her husband on Saturday back in Washington. But aides would not rule out the possibility of a low-key celebratory dinner for the two tonight at their Denver hotel.

Tune in to ABCNews.com today for live-streaming coverage of the first 2012 Presidential Debate from Denver, Colo. Coverage kicks off with ABC News' live preview show at noon, and full debate coverage begins at 8 p.m.

The Obamas are expected to arrive at the debate venue together around 6:25 p.m. MT/8:25 p.m. ET. Mrs. Obama will take her seat at 6:44 p.m. MT/8:44 p.m. ET and will be introduced second, after Ann Romney.

Aides to the president have been tight-lipped about any pre-debate rituals he might have back stage, but described his mindset and attitude today as very focused and "even-keeled."

Obama, who has a well-known competitive instinct, is eager to get out there and perform, they told ABC News. He told supporters on Monday in Henderson that debate prep has been "a drag" and that he's been cooped up, having to do his "homework" - signs he's itching to move on.

In keeping with his daily routine, the president worked out in the gym at the Westin Lake Las Vegas this morning and received the Presidential Daily Briefing. He did not interact with any voters today, making no unexpected stops in Vegas or Denver.