Sometimes there is just not enough money to make all the bills on time. A higher than normal gas bill, or unplanned expense can make the ends no longer meet as neatly as they should. Merely taking odd jobs is not the answer since these can become undependable just when you need the money the most.
Finding evening jobs is the answer to this financial crunch. Many fast growing companies don't shut off the light and go home when it gets dark. Since they are open for business, they need you to help them continue to serve their customers or industry well into the night.
Finding one of these positions is very much like finding your day job. A CV will be required, as well as references. The difference with working evenings is only as diverse as you would like it to be.
If you work on the phone all day, you don't necessarily need to look for anything similar at night. Along with the extra money, this is also a chance to try a job that appeals for other reasons.
A second job will not only give you more income, it is also extra experience. You can have an inside view into new companies, and make contacts in other business beyond your primary career.