A few opportunities for short bits have come to my attention over the last few days:
here. And thanks to Christine and Robin for drawing my attention to that one.
Finally, there's a Lighthouse competition for 30-second videos for an exhibition, 30 seconds of Fortune. I'm working on something for this one for two reasons: first, I haven't shot anything for quite a while and so I can warm up my film-making muscles before starting on a (slightly longer) short of my own that I aim to make next year. Second, I like the challenge of doing a narrative in 30 seconds (though entries don't have to be narrative).
If you enter any of them, good luck to you.