I know it's rather difficult to establish a ranking of publications, especially because the ones in charge of establishing values for venues might be biased by their field, and several other aspects. However, I know some well-accepted (at least locally) ranking, that consider all fields under research, e.g. Brazilian Qualis - in portuguese - that includes both confs and journals, and Australian ERA - this latter has served as baseline for some class A conferences in Computer Science (my research field), in some countries other than Australia.
Hence, I wonder about the existence of another "global ranking", that has been applied overseas, thus including at least the most prominent events and journals in every field. For journals, it's a little bit easier to measure its importance, by looking at their Impact Factor values, but for conferences it's a little bit tough. To the best of my knowledge, I don't know a largely-applied means of measuring the impact of a conf.
I'd like to hear from you. Thanks in advance.