So, I played in Simon and Adrianna's LARP, the Grove of Fallen Leaves. It was all very last minute - I agreed to play a little more than 24 hours beforehand, due to a player pulling out.
The first obstacle was actually making it to the LARP. This shouldn't have been an obstacle, except that I had to take my bike in to get the choke cable repaired, and they did not let me know that my bike would not be ready until quite late. However, by use of the less than optimal Cape Town train system, I was able to make it across (relying on Simon and Adrianna's hospitality to work around the lack of trains back until the next day).
The LARP was fun. My theatrical background was probably a it of a disadvantage, since I was more likely to play the character, rather than the game situation, although, given the way the game went down, I'm not sure i there was much I could have done differently to change things.
The LARP suffered from hitting a critical level of mistrust, and, despite trying to play a conciliatory role, the rest of the players were more interested in mistrusting each other than actually resolving anything, which was somewhat frustrating.
Still, overall, I had good fun, which is about the best one can expect out of this sort of thing.