add 3 events

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[stefaniebutland]

Adding 3 events. Need some items to complete this PR.

ESDS Tech Spotlight
Has general info only. @jules32 can you please suggest for the ESDS items below?

• [x] what are the mentors presenting?
• [x] image

2024 NASA Champions

• [x] Stef create Cohort website (linked from event page)

California Water Data Consortium

• ready to publish