You can join the workshop at Hacktivity 2022, on the second day at 09:15 CET.
Git repo: https://git.hsbp.org/six/pwn_w3bridges
Git mirror: https://github.com/smilingSix/pwn_w3bridges
Workshop info: https://2022.hacktivity.com/index.php/workshop-sessions/
Coding languages: solidity, python3 and rust.
Blockchains: Ethereum and Substrate (you can exploit vulnerabilities from this workshop very similarly on both chains)
Alternatively, you can get through the challenges remotely, by yourself 😉