My son did some summer volunteering at the Computer Lab at the senior center. He also did a lot of informal helping his GC navigate the school computers. He did some unpaid computer modeling stuff for various professors, which is also volunteering really, though not what most people think of. NHS usually requires volunteer hours. I don’t know if anything actually came of this, but it makes for interesting reading: https://mcc.gse.harvard.edu/reports/turning-the-tide-college-admissions