Seasonal jobs that might turn permanent - what worked for you?

A staffing agency says some roles convert to permanent after 15 weeks. Hours ramp up in the coming weeks. Which employers treat seasonal workers well?

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

Thanks for writing this out. I went through something close to it 10 months ago, and it got easier once I kept a simple log of every call and form.