iAnn, a resource/service provided by itico aims to produce a curated, non-redundant, list of events (most conferences and courses), many of which are bioinformatics-related (many of the people involved in it are bioinformaticians). Indeed, the ISCB (International Society for Computational Biology, one of the major bioinformatics organisations world-wide) use iAnn to provide a list of relevant events on their own site
It's easy to filter, and the non-redundancy is a really nice feature.
For full disclosure - I am involved in several projects that use iAnn, and know the developers involved in it, so am not unbiased - having said that, my reason for using it and interacting with these guys is that I find the project and output good and useful!
Hope it's useful for some of you.