Metallica are encouraging fans in the UK to donate blood and plasma ahead of upcoming tour dates. Multiple outlets report that the band is making the request as they move into the UK leg of their “M72 World Tour,” following concerts that close out the European part of the schedule. The campaign is described as a collaboration with UK health services, including the NHS, and is aimed at increasing the number of blood donors. Several reports note the appeal is framed as an effort to “step up” and “be part of something bigger than the show.” The push is linked to specific UK events, with BBC News mentioning a concert in Cardiff in June, while other coverage refers more broadly to Britain tour dates. Overall, the outlets agree that Metallica’s message urges supporters to donate blood (and in some cases plasma) in the run-up to the shows, positioning the request as a way fans can contribute beyond attending concerts. No source details changes to the tour itself; the reporting focuses on the donation appeal and the band’s partnership with donation services.