Well, you've mentioned the one I was going to suggest
But, seriously, part of the reason I set these concerts up was because I wanted an opportunity to inflict my singing on a captive audience

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There's nothing to stop you doing likewise and setting an event up. Either a concert with others or, as I'm doing on the Tuesday before the Adult Learners' Concert, your own recital. I can help you with advice on that, if you're interested.
Or if that's a bit ambitious, ask a few friends round for an evening of music, drinks and munchies.
Also, you could ask your teacher if you can set up a pupils' event. And also ask your teacher about any masterclass opportunities, and also check on Google.
Another idea to consider, I sing in a local church as the visiting soloist twice a month - might there be one near you that would appreciate a pianist's services?
Then there are music festivals - that might be worth a try.
Best of luck with whatever you decide.
Cheers
Katyjay