Q.Can I replant gladiolus in mid summer in zone 8B?
I live in north Florida, zone 8b. The gladiolus that I planted in March (in large planter boxes) have finished blooming. The plant tops are now beginning to turn brown and are no longer attractive. What I would like to know is… would it be a bad idea to dig up the bulbs, dry them a few days, and replant them? Could I expect another blooming this year?

This would not be a long enough recovery for for Gladiola corms.
I've listed a few articles to help you.
https://www.gardeningknowhow.com/ornamental/bulbs/gladiola/storing-gladiola-corms.htm
https://www.gardeningknowhow.com/ornamental/bulbs/gladiola/care-of-gladiolas-how-to-grow-gladiolas-in-your-garden.htm
https://www.gardeningknowhow.com/ornamental/bulbs/gladiola/growing-glads-in-containers.htm