MANILA — About 260 people were sent to hospitals on Wednesday after they apparently fell ill from food poisoning during the 90th birthday celebration of Imelda R. Marcos, the former first lady of the Philippines, health workers said.

The patients “suffered from vomiting and dizziness,” said Richard Gordon, the chairman of the Philippine National Red Cross, which deployed emergency teams to a sports complex east of Manila where the party was held.

Mr. Gordon, who is also a Philippine senator, said hundreds of the estimated 2,000 people at the event apparently became ill after eating meat stew and eggs.