Young CryptograpHers Cybersecurity Summer Camp
https://youngcryptographers.org/

Mathcrypt (including previous editions)
https://mathcrypt.org/

CBCrypto (including previous editions)
https://www.cb-crypto.org/

Algebra, Codes and Cryptology conference - A2C
https://www.a2c-conference.com

The 7th Code-Based Cryptography Workshop - CBC 2019
https://cbc2019.dii.univpm.it/home

The 6th Code-Based Cryptography Workshop - CBC 2018
http://www.math.fau.edu/codebasedcryptoworkshop2018/

New Zealand Mathematics and Statistics Postgraduate conference - NZMASP 2012
https://nzmasp2012.webs.com/