[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/12/20/art.inaug.cnn.jpg caption="DC is getting ready for the big day – but some are worried about the morning after."]WASHINGTON (CNN) - When President-elect Barack Obama takes the oath of office next month, the nation's capital will be the site of a massive celebration. But local officials are worried they might get stuck with the check.
Even for a city used to big crowds, Obama's inaugural promises to shatter records for attendance. City officials predict up to 2.5 million people will converge on Washington January 20, and they are taking unprecedented steps to accommodate the masses. Plans are in the works to open up the National Mall, extend hours for public transportation and - perhaps most daunting - provide parking for the influx of revelers.
"Even though we're very practiced at inaugurations and large events, this is one that will rewrite the book on inaugurations," said the Rep. Eleanor Holmes Norton, D-DC, who has requested an additional $15 million from Congress to help the city cover costs. That would double the $15 million Congress has already allocated to pay for all national events and demonstrations in Washington during 2009.
DC Mayor Adrian Fenty agreed costs for increased security and crowd control would dwarf the original allocation. And for a city facing a budget shortfall and the same economic downturn affecting the rest of the country, now is not the time to rack up debt, Fenty told CNN.
"We are in talks with the federal government as we sit here today to let them know - I think they already know that that's not enough," he said, referring to the $15 million already allocated. "Now the question is if you want to make sure that you cross every 't' and dot every 'i', it does look like it's going to be significantly more than that."
Fenty predicted costs for the city would run close to $50 million, the same amount Congress provided to both Denver and St. Paul, Minnesota to host the Republican and Democratic conventions earlier this year.
Unprecedented numbers of people, he said, means more services: "More buses, more federal cooperation, more emergency medical service workers, more police officers needed, more hotel rooms needed, more streets that are going to have to be closed, more water in case it's hot and more places to stay if it gets particularly cold and people need some type of hypothermia relief."
The city will double its 4,100-member police force by calling in officers from out of the district and is working with local transportation officials on how to move people downtown to watch the festivities.
It's not all bad news. With the crowds comes an uptick in tourism, city officials said. Bars will be open until 4 a.m. to accommodate revelers, and hotels in the area are selling at two or three times the normal rates. Washington residents are embracing the news by flooding Craig's List with offers to rent their homes and apartments to out-of-towners.
"There'll be plenty of people coming, using our grocery stores, restaurants, movie theatres, hotels; spending money, enjoying themselves," Fenty said. "And when they see how great a city this is, if they didn't already know, they certainly will return."
Inaugural planners say interest in the inaugural celebrations has been enthusiastic and nonstop. Presidential Inaugural Committee spokeswoman Linda Douglass said 35,000 people have already registered to volunteer.
"We know there's a lot of energy here and we want to do everything we can to accommodate that," Douglass said. " We've been told there is going to be a very big crowd coming, and we are working with the city and the federal officials to do everything we can to make sure they can get here, that they'll be safe, that they'll be comfortable and that they'll be able to participate in some way."
For all the tourists who do turn out, Fenty said no matter what the cost, the city will work to charm its visitors.
"We want everyone to have a great time," Fenty said. "We want everybody to enjoy the nation's capital, and come bring your friends, bring your family and then hopefully just be a part of history."