Migrate event dates to use native dates instead of strings to support advanced date queries

[victor-enogwe]

Priority

High (would significantly improve my experience)

Feature Description

No response

Use Case

No response

Additional Context

No response

Contribution Interest

• [ ] I would like to help implement this feature
• [ ] I can help with design/mockups
• [ ] I can help with testing
• [ ] I can help with documentation
• [ ] I'm just suggesting, not planning to contribute