When creating a plan you also have to distinguish to which season or year the plan belongs to. This way the plans of that season will automatically be shown correctly on the sign up form and the plans will expire automatically.For seasons that follow the calendar, choose the one of that specific year. The plan will expire after 31 December of that year. If you have seasons overlapping two calendar years, the best thing to do is select the season that also overlaps those years, for example 2019/2020.