Currently I do the same kind of thing at Castell Henllys Iron Age fort in West Wales - but I retire at the end of March... Basically I I dress in repro Iron Age kit and demo fire lighting and cordage making, talk about Iron Age society, architecture, warfare, culture and the history of our site - a real Iron Age fort with the round houses etc rebuilt on the footprint of the original roundhouses as found during the 27 year long archaeological dig. I the summer I also ran "Ancestral Skills" sessions - Flint and Steel fire lighting, nettle cordage making, stone tool/ornament making including drilling stone using Bow Drill techniques and a bit of foraging .... AKA "Bushcraft intro" sessions!
They call it work (and they do pay "The Living Wage") - but to me it is just great fun!
We also do a bit of Stone Age and Viking stuff for visiting school groups but I really stick with the Iron Age
I recently sold a large part of the "Stone Age" artifacts I have made to the Community Archaeologist for the Pembs Coast National Parc ... but kept back enough to run a pretty good session myself.
I have visited the Crannog Centre in the past and plan to visit again (once retired) and I may even pitch up in full Demetae costume...