On Wednesday August 11, the battlefield at Pennsic XXXIX will feature the Battle of Hastings - Chainmail Battle, a period armor battle for those with 11th century armor.
From the Pennsic Martial Tourney descriptions:
The year 1066 is a turning point in history. Choose a side - defend the Saxons, or join attacking Norman forces - and use your strength of arms to help decide the day. This is a special rules melee. We've attempted to make this event a time for fighters to showcase their beautiful mid-period kits in an atmosphere recreating the feel of battles in the 11th century.
1) A combatant may count the first strike they receive against mail as light.
2) In general, any form of armor that is documentable to the Battle of Hastings is acceptable.
3) General rules: no exposed plastic (plastic gauntlets OK), no exposed duct tape, no exposed modern sports gear, no exposed modern logos, no blatantly modern footwear.
4) Helms: spangen or conical construction preferred. No closed faced helms of any type, and no blatantly 12th century+ helms.
5) Torso: anything documentable to the period. Mail has an advantage, but a padded or even plain tunic is documentable as well.
6) Limb armor: greaves and vambraces may be exposed, all other limb armor should be hidden (exceptions may be made here for the first year of this event).
7) Gauntlets: any are acceptable (even plastic); this is a safety factor which supersedes historical practice.
8) Shields: round or kite. No later period designs (heater, etc.).
9) Weapons: Primary weapons should be spear, axe, great axe, sword, seax. Thrown weapons OK. Combat archery OK. No weapons that are undocumentable to the place and time.
10) Force commanders require one extra mortal wound to kill.
Best two of three battles. Victory is achieved either by destroying the enemy force, or by killing the enemy leader (routing the force he commands).
Participants are asked to bring some small token as "loot"; the side losing two of three battles will give someone on the other side their "loot" token. This should not be an expensive item, but rather a token of victory on the field that day appropriate to your station.
Descriptions of other Pennsic battles are also available on the website.