Is there a way to skip a meeting?

There is no 'skip meeting' button in Tadum. Instead, you can just update the date to either a rescheduled time or to the time of your next regularly scheduled meeting. Tadum will automatically update the meeting going forward. 

Click on 'Edit this meeting' under the meeting title and you can easily change the date and time. This prevents cluttering up your sidebar with empty agendas.