The thick-skinned homework who calls himself a "summer friend" or making a report of experiment or observation or research etc.. where students can freely choose the theme
When I was in elementary school, a workbook called "Summer Vacation Friends" was one of my summer homework assignments. I think it was about 20-30 pages of problems. Depending on the region, the name is different, but according to this article, there are places that do not have this at all. There was an article about "Summer Vacation Friends" in Tochigi Prefecture in 2020 (the title photo is also quoted from here).
Also, according to this article, in Gifu Prefecture, "Summer Vacation Friends" has been published for more than 70 years without change due to the passion of teachers. However, in Gifu Prefecture, reading is the main focus. Editing know-how is also accumulated.
However, I think that the burden on teachers who are in charge of such work in addition to their main work is not small. This is because, as you can see from this article, there is a shortage of teachers.
In fact, according to this article, there is a shortage of teachers in Gifu prefecture as well.
I think we live in an era where we can no longer rely on the “passion” of individual teachers. I think that the significance of existence of "Summer Vacation Friends" should be confirmed every year.
And when I was in elementary school, there were many other things to do, such as paintings, handicrafts, reading reports, report of experiment or observation or research, and summer vacation homework.
For making report, I once relied on the appendix of "Gakken no Kagaku". Each student presented their “research” results on a large sheet of paper.
Gakken no Kagaku has long since ceased publication. However, Gakken has issued a special issue to meet the demand for summer vacation, and it seems to have a good reputation.
The wrinkles of "that disease" were gradually appearing to the extent of the experimental experience of science. In that sense, I think it's a good idea to try a science experiment that you can do at home during the summer vacation.
If you search for "自由研究" on the Internet, you will find multiple articles on candidate research themes. But this also depends on whether the student has an internet connection, as in the previous article.
Both those who teach and those who teach have problems.