A Democratic committee spokeswoman declined to comment on the documents.
But a committee spokeswoman said today that Mr. Huang would not be available.
In some cases, the companies are offering the tickets at four to five times the listed price, a committee spokeswoman said.
The Democratic National Committee is airing a new 30-second commercial this week in 20 states, in what a committee spokeswoman called a $1.6 million campaign.
"There's a confidentiality agreement," Julie Black, a committee spokeswoman, said.
"The tickets are $10, $50 and $100," said a committee spokeswoman, Patty McQueen.
A provisional date for the session has been set for March 6 and a committee spokeswoman said it is likely that witnesses will be called.
Alternatives Are Considered "It is not feasible to wait until after the election," the committee spokeswoman said today.
The separate individuals being served with subpoenas are people who have been members of Enron's board since 1992, Leslie Phillips, a committee spokeswoman, said tonight.
As for which provision and when, a committee spokeswoman, Carol Guthrie, said that "everything is on the table."