Senator Clinton is ending this campaign fund-raising period with a series of mega-events that seem designed to hold off her leading Democratic opponent, Senator Obama, in the race for money.

Mrs. Clinton held three fundraisers yesterday and has several more on the calendar before the end of the month — including one at the Long Island home of Cablevision mogul Charles Dolan and one with billionaire Warren Buffett.

According to an e-mail that was sent out to Mrs. Clinton’s supporters and forwarded to The New York Sun, Mrs. Clinton is also holding an “Indian Americans for Hillary” fund-raiser at the Sheraton in Midtown Manhattan on Sunday night for a constituent group that she has been actively courting.

And she is dispatching one of her senior surrogate campaigners, Senator Schumer, on Monday morning to headline a forum for voters who have already donated the maximum allowable amount, $4,600, to her campaign. That event — which the e-mail dubbed the “Maxed Out Women’s Issues Series Forum” — will be held at the prestigious New York law firm Weil Gotshal & Manges. While it will not raise any money outright, wealthy donors are regularly encouraged to tap their friends for more cash.

While several other 2008 presidential candidates will be ending this filing quarter with fund-raising blitzes (Mayor Giuliani has a large one scheduled in Manhattan for tomorrow night), on the Democratic side, all eyes will be on how her cash collections compare to Mr. Obama’s. Those closely monitoring the campaigns are predicting that Mr. Obama will out-raise her in this period.

In the first fund-raising period of 2007, the former first lady raised $26 million. Mr. Obama, a relative newcomer compared to Mrs. Clinton, nearly matched her. He raised about $25 million, but had even more money designated for the primary than she did and had double the number of donors, indicating that he has a larger base of support.

In a show that the Obama campaign is employing the same strategy of locking up a larger number of smaller donations, he is holding a “lower dollar” event at the Hammerstein Ballroom on 34th Street on Friday night, where entry is between $100 and $500 a head.

Mrs. Clinton has downplayed the significance of the money race. Last week, she told reporters, “It would mean nothing to my campaign,” if Mr. Obama raises more. She noted that she was out-raised “two to one” in her first Senate race. In addition, public opinions polls show that she is surging.

Still, both she and President Clinton have been tirelessly crisscrossing the country to make their pitches for more money and endorsements.

A professor of political science at the University of Virginia, Larry Sabato, said Mrs. Clinton is trying to ensure that Mr. Obama’s strong showing is not the take-away message from the next filing period.

“She is having to push hard because the rumors are that Obama has done so well again,” he said. “Her problem is not that she doesn’t have enough money. It’s rather that her fund-raising base is surprisingly small by comparison to his. He had the lion’s share of small contributors to this point.”

Mrs. Clinton’s campaign aides estimate that the she will raise about the same amount in this period as she did in the last. Published reports indicate that she and Mr. Obama are likely to raise even more. But campaigns often float numbers to set expectations before amounts are made public.

A Clinton aide said yesterday’s fund-raisers in Buffalo and Rochester each fetched about $150,000 while another event headlined by Governor Corzine in New Jersey last night may have brought in about $1 million.

“The last two weeks of the quarter are just fund-raising time,” Mr. Sabato said. “That’s all the days amount to, one fund-raiser after another.”