The National Park Service canceled part of Friday’s program commemorating the 150th anniversary of the Civil War Battle of Bull Run in Manassas because of excessive heat, officials said.

Outdoor events scheduled between 2 p.m. and 6 p.m. have been called off, but museums, exhibits and the visitor center at the National Battlefield Park will remain open. All scheduled events from 8 a.m. until 2 p.m. will continue as planned, but with shortened presentation periods, according to officials.

The 6 p.m. program “Behind the Lines” will continue as scheduled . The Park Service has more information about the schedule, bus service and the events on its Web site.

“As things stand now, weekend events are on as scheduled, but we’re watching the heat,” said Bill Justice, a spokesman for the event.

The Capital Weather Gang is predicting a high of 102 on Saturday and 95 on Sunday.

Justice said officials have placed water coolers around the park and have three first aid tents equipped with fans to keep people cool. So far, no visitors have been treated for heat-related problems, he said.