The Rev. Dr. Alan Walker, an internationally known Australian evangelist, will begin today a series of evangelistic rallies for the United Methodist Church in the Washington, Maryland and Delaware area.

Walker will begin his tour today with a congressional prayer breakfast, followed by his first big public event, a gathering at Constitutional Hall at 7:30 p.m. Sunday.

The appearance here of the Australian evangelist is part of a worldwide Mission to the Eighties evangelism campaign, which will be conducted in 90 countries under the direction of the World Methodist Council.

The Rev. Winifred Walker, also an evangelist, is participating with her husband in the campaign.

On Sunday, Alan Walker will preach at 11 a.m. at Israel Christian Methodist Episcopal Church, 557 Randolph St. NW, and at 1 p.m. at the John Wesley AME congregation at the Simpson-Hamline Church, 4501 16th St. NW before the rally at Constitution Hall.

Winifred Walker will preach Sunday at the 11 a.m. service of the Mount Vernon Place United Methodist Church, 900 Massachusetts Ave. NW.

The couple will meet with a number of Hagerstown Methodist groups on Monday and address a rally at the North Hagerstown High School at 7:30 Monday night.

The Walkers will be in Salisbury, Md., on Feb. 27, with appearances in Baltimore on Feb. 8 and 9. They will conclude their visit here with rallies at Constitution Hall, March 1 and 2, at 7:30 p.m.