I emailed a bit with Justin from London Lua and he expressed interest in having a Wikimedian present, either in person or remotely, about what Wikimedia's going to be doing with Lua. There is already the video tutorial
https://commons.wikimedia.org/wiki/File:Berlin_Hackathon_2012_-_Lua_introduc...
and the written tutorial
https://www.mediawiki.org/wiki/Lua_scripting/Tutorial
in case you want materials to use. And if it would take a little money for you to get to London, the Wikimedia Foundation might be able to reimburse travel expenses: https://meta.wikimedia.org/wiki/Participation:Support