The easiest way to do it is by visiting www.crowdcast.io/celoorg. There you'll see both the past and upcoming virtual events. You'll just need to register to be able to access all the content freely. I suggest you also click on "Follow" to keep track of everything.
The other way is Celo's Youtube channel here: https://www.youtube.com/celoorg. There you can click on "Videos" and then select "Upcoming live streams" or "Past live streams" on the pulldown menu above, depending on what you are looking for.