Activities in Might & Fealty are the umbrella term for referring to any multi-character event in game that is not a battle that has mechanics to support it.
At the time of this writing the following activities are planned or in some stage of development, and may appear in upcoming updates.
Duels are a catch-all term for any one versus one combat or sparring. They can be used to test skills against one another or to settle a blood feud. Or anything in between.
These can be anything from a singular grand melee or a massive, multi-hundred member, round-robin style double-knockout event, based around any of the implemented skills.