Part-time jobs that fit around childcare (Oklahoma City)

I am looking for part-time work that fits around school hours and found a few evening shifts near Oklahoma City. I am in Oklahoma City, in case local advice matters. They can give a schedule two weeks ahead. How many hours do they guarantee?

I worked evenings at a hotel. The hours were steady and the team was friendly, but weekends were busy.

I got the job by going in around mid-morning and asking for the manager. Worth a try.