JaJ,
Its pretty much ad-hoc/free-flow. I run my IFA business in parallel, so do it on a voluntary basis when tasked by the FSA/MoD (I tend to pick up the RAF and many Army requests) or when someone sends me an e-mail/PM asking me to present somewhere. If you're interested, its best/easiest/quickest/simplest! to drop me a PM and we can take it from there.