When I was speaking at Questing Heirs in Long Beach yesterday, they announced this event. Knott's Berry Farm is having a Civil War Encampment on Feb 14 and 15. This will take place outside of the park, where Independence Hall is, so it is free but I'm sure you will need to pay for parking.
There will be 200 Civil War re-enactors with displays. Living history presentations including military drills and cooking will take place. President Lincoln will be there delivering his Gettysberg address. For more information check out the event calender at Knott's website at http://www.knotts.com/park/calendar/index.asp.