Some info:

The Stanford Blockchain Conference 2020
Arrillaga Alumni Center, Stanford University
Feb. 19-21, 2020
https://cbr.stanford.edu/sbc20/

2:30pm   
The Celo Ultralight Client
speaker:   Marek Olszewski and Michael Straka, Celo

https://diyhpl.us/wiki/transcripts/stanford-blockchain-conference/2020/celo-ultralight-client/