Seasonal jobs that might turn permanent (San Diego)

A staffing agency says some roles convert to permanent after 9 weeks. There are 9 people counting on me, so I am trying to be careful. Hours ramp up in the coming weeks. Which employers treat seasonal workers well?

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.

Apply to several. Start dates and schedules change quickly and having options helps.