How often do they have battle reenactments?

There is one major reenactment in July each year, but you'll find living history events with uniformed reenactors around the battlefield most weekends while the weather is good. They won't be battling, but they give lots of demonstrations.

Reenactments never take place at the Battlefield/NMP. The Park does not handle or host the reenactments. That said, every year there is a reenactment in the next town over to Gettysburg, on farmlands. It happens on anniversary of the Battle or weekend closest to those days. Battle was July 1-3. Great event to see. Thousands of reenactors participate -- some years upwards of 12 to 15000 reenactors.

The parks deptartme nt handles all of that