Neil Burridge of Bronze Age Swords is teaching a spear casting workshop at Berrycroft Hub in Oxfordshire, England on 11 June 2022. I am not sure whether he uses modern casting techniques or historical horsedung-and-clay moulds. The event has a website here (link). I am told that some people are travelling again and the COVID pandemic is likely to be in a lull in summer 2022.
PS. The roundhouse at the Scottish Crannog Centre at Loch Tay, Scotland burned down on 11 June 2021 (link). You can follow their situation at https://www.crannog.co.uk/ There is a new project to rebuild a broch in Caithness, Scotland at https://www.thebrochproject.co.uk/