Post function can be a plugin or a groovy script (using script runner plugin) .
A similar groovy script example is here
Just to be clear on your requirement
Reading your question implies the process should be:
However, I suspect that's not what you meant, and what you actually want is:
Hey Everyone! Unfortunately, the venue that was hosting us on the 23rd has pulled out so we're looking for a new venue. If anyone would have a room free that we could use on the ev...
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