Depends how it's run and when.
DD had it in secondary for 4 years, once a week, they could choose a subject and it was across all year groups, it changed after the February half-term, so around 1/2 year per topic.
She did Latin, vlogging, Roman and Greek history, astrology, first aid, movie club.
They also had several arts and language clubs, creative writing, sports, music, philosophy, media, current affairs discussions.
She liked it as it meant they could try something new without the pressure to get grades or continuing it. Plus she liked the mix between 11 and 18 year olds.
In Y11 they started enrichment in one week beginning of July, so after the Y11 and 13s were gone.
That was mainly day trips, workshops, team building games. As DD was in Y11 then, she "missed" but based on what people from younger years said, it wasn't the most existing but a good way to destress from exams as the school did all their year-end tests between May and July.