Hey Seyda,
Great to hear you're keen to get involved. I can see you're already on the Unleashed Action Team. I'd also suggest joining the Animals Australia Action Network. This is how we alert people to most activities: http://animalsaustralia.org/action/
There should be a newsletter for that, it'd be awesome, like e-mail based, people tend to check their e-mails often Like you go to a page and select your town and it send you the place and time, it'd be cool
Like you go to a page and select your town and it send you the place and time, it'd be cool 
