Jobs at small Fresno companies nobody posts about after 4 years as an event coordinator

Two small Fresno employers told me they are hiring but have not posted yet. Any experience at all would help. They prefer people who can start within a couple of weeks. Should I visit in person?

A short email with two sentences about what you can do and your résumé attached worked for me. I followed up after a week.

Thanks for writing this out. I went through something close to it last year, and it got easier once I kept a simple log of every call and form.