What are the good themes of hard-pen calligraphy activities in primary schools?

If it's an activity topic, I have some suggestions for setting it up.

① Hard-pen calligraphy exhibition competition with the theme of "My Summer" (primary school students can be invited to extract or create poems about summer)

② Hard Pen Calligraphy Competition with the theme of "Every word is sweat, and the pen is diligent"

③ Creative hard pen writing activities with the theme of "Writing 2020"