The American Statistical Association has an annual poster competition for students in Grades K-12, with separate winners in Grades K-3, 4-6, 7-9 and 10-12. The aim is to increase statistical awareness and understanding via a statistical poster containing two or more related graphics that summarize a set of data, look at the data from different points of view, and answer specific questions about the data in a coherent manner.
The Washington Statistical Society awards prizes for the competition in the Washington, DC metropolitan area. Winners of this local competition are then entered into the national competition.
Details of the 2019 poster competition are here.