Is it okay to submit a paper to a conference or publication from another field?
There isn't anything wrong with submitting to a conference that might not be a perfect fit. I would urge you to ensure that the fit is decent enough that you won't be wasting anyone's time, but cross-polination can be great for both fields.

When I was a graduate student and was helping my advisor review papers for a prominent conference, I read an outstanding paper that I didn't believe was on-topic for the conference, and I suggested to my advisor that it should be rejected it even though it had a novel (and cool) contribution. When I discussed it with her, she said that for really excellent papers, program committees will sometimes be flexible. If I was convinced it was that good, she said, I should give it a positive review and let the committee sort it out. In the end they accepted the paper. It was very well-received at the conference, and the authors were excited to get the paper into the competitive conference, where it would undoubtedly be seen by a lot of people.