What sources of information are there to find suitable congress, reunions, convention and other scientific gathering events?
A quick search at the CORE conference ranking website produces the following:

Tier A:


IEEE Computational Systems Bioinformatics Conference (CSB) [can't find a link! WikiCFP seems to think it hasn't been held in a while either]


Tier B:


Asia-Pacific Bioinformatics Conference (APBC) Perennial website
Workshop on Algorithms in Bioinformatics (WABI) 2018 website


Tier C:


Bioinformatics Visualization (BioVis) 2018 website
IEEE Bioinformatics and Bioengineering (BIBE) 2018 website
IEEE Symposium on Computational Intelligence in Bioinformatics and Computational Biology (CIBCB) 2018 website


An alternative venue for searching for relevant conferences is WikiCFP, which gathers Calls-For-Papers of a great many conferences.