Add Mastering CI/CD spanish webcast.

Why is this change being made?

• Would like to Add Mastering CI/CD Spanish webcast to the events yml to promote on the page.
• Would like to Add Mastering CI/CD Portuguese webcast to the events yml to promote on the page.
• Would like to Add Mastering CI/CD French webcast to the events yml to promote on the page.

Does this MR meet the acceptance criteria?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what