We LARP at public parks, so other members of the public may also be using the park during our LARP.
When encountering non-LARPers at the park (including parents and non-LARPing siblings and friends) — whether on a field of battle, on a trail, or anywhere else in the park — go out of your way to be both polite and friendly.
Slow down (if you are moving fast). Move to the side (if you are on a trail). Say “Hi!” Smile and wave. Especially, stop any mock combat!
If you spot a non-LARPer entering or coming near an ongoing mock battle, shout “Hold!” Wait until the non-LARPer is well out of the way before shouting “On Guard! … … Lay On!” and resuming mock combat.