Our last show was Saturday so we're in the off season now. I'm planning on working my mare 2-3 times a week--light work 20-30 min, and a casual drive 1-2x a week depending on the weather. I like to practice obstacle regularly to keep it fresh.
During show season I practice 4-6x a week, driving 3x and practicing jumping and obstacle. Sometimes I do lunging but I find it really boring and we don't have a round pen.
Kent Gro/Show pellets, beet pulp, body builder, daily wormer, weight builder (if needed). Quality hay. All twice a day. Body builder they get 1x a day by mouth.