It’s highly encouraged, and we’ve made it easy - when you schedule your event on Hackster, you can just click “publish to hackster”. Meetup.com has an established community in most places and is a great way to attract participants.
Some countries have unique event sites as well that can be used to effectively broaden your reach. For instance, in China, this site is more popular so we use it for our Chinese meetup: http://www.huodongxing.com/
It's fine if you prefer to use a facebook page or even just your Hackster Live page to schedule events. Just be sure to link whatever page you decide to use to your Hackster Live page.