Seasonal jobs that might turn permanent (Denver)

A staffing agency says some roles convert to permanent after 13 weeks. I have been trying to stay organised about it. I would like to avoid a gap in my résumé. Which employers treat seasonal workers well?

I was converted after one season because I showed up every day and volunteered for extra shifts. Managers remember that.

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