Setting a schedule is a fantastic way to ensure you get repeat traffic from the people that really value your content and want to see you. Without proper scheduling, it gets really hard for people to catch you.
However, if you arenít able to set a solid schedule, set as much of one as you can and throw up a stream whenever and wherever you can. Having a stream is always better than not having a stream! Just donít be disheartened if the viewership is a little lower for the impromptu ones.