But he ended up being taught in isolation at Milford Haven School after it said he broke its haircut rules.
The school said Rhys could return to normal lessons on Monday but it was disappointed by Friday’s demonstration.
Rhys and a friend, 14, had their heads shaved as part of the annual UK-wide Macmillan Coffee Morning on Saturday and raised about £700.
But the Milford Haven School policy on hairstyles says “no shaven heads” so he was told he was not allowed to return to his normal classes, instead doing “supervised study” at school.
Source: BBC News