At the moment it's mostly me that's running events (and I'll likely be using this place in the future myself), but it's not like I've got some kind of monopoly on it. Go ahead and use this place to organise your own stuff if you want to. Better yet, send me a message and I'll see what I and SpA at large can do to help you.
Same goes for Highlander events, but as those are pretty common just use the Highlander Events board for them.
If you think you'll be running a bigger event that could use it's own subforum/board send me a message and we'll see if we can figure something out.
SpA is a great community and it's a community that likes it when cool stuff happens. So, go and make some cool stuff happen already!