Rating scientific (or not so much) conferences

If you work in research, nowadays you can be sure to get swamped with "conference invitation" e-mails. A large part of these is, in effect, spam - attempts to get you (or your funders) to pay for meetings of highly questionable scientific worth. So, let's introduce a rating scale for scientific (or not) conferences, from 0 to 10. All examples have really happened. 0 - Trash You ask a friend who is…