I am PhD researcher on Law and AI. Because there are so many conferences about AI, it gets hard to find the most suitable to go to. Let me rely on your ideas. I appreciate any suggestions. Thanks!
You can also have a look at the core ranking: http://portal.core.edu.au/conf-ranks/?search=0801&by=all&source=CORE2018&sort=arank&page=1
Research field 0801 is for artificial intelligence and you can also see the ranking of the conferences.
Apart from that, I would say you should visit one of the big conferences such as IJCAI, ECAI, or AAAI as they cover a broad range of topics. That way you can also get a feeling where your research fits into.