Linking the star categories to their origins. Suggested event categories which are responsible for the observed limited-r (regime 1 and 2) and r-process enriched (regime 3 with subregimes r-I and r-II) stars. There is a close connection to the event categories I, II, and IIIa and IIIb, although there is not a one-to-one connection. This is due to the fact that the observational regimes are determined by [Eu/Fe] intervals (< −0.3, < 0, < 1, and > 1, which are not only determined by the ejecta of event categories, but also due to inhomogeneous ejecta mixing with the ISM in the early Galaxy. While the actinides (e.g., Th) are only found in r-I and r-II stars and only produced in category IIIa and IIIb events, lanthanides and rare earth elements also have various contributions from category I and II events. Among the compact binary mergers, all systems that contain a black hole initially or lead to fast black hole formation with BH accretion tori fall into category IIIb, while those that contain a stable or meta-stable massive neutron star for a long duration fall into category IIIa. The initial (before collapse or merger) is indicated as well, but is altered due to weak interactions during the explosive events.