Is there a central repository of bitcoin conferences? I currently use CoinDesk to remain abreast on events and conferences. Any other websites I should utilize?
It depends on what exactly you are looking for. If you want to publish academic research, the most well known conferences are:


Conference on Computer and Communications Security (CCS)
USENIX Security (USENIX Security)
IEEE Symposium on Security and Privacy (S&amp;P)
Financial Cryptography and Data Security (FC)
Conference on the Theory and Applications of Cryptographic Techniques (EUROCRYPT)
Network and Distributed System Security Symposium (NDSS)


Note that if you are not academically interested, those might not be for you.