feat: Added required fields and schemas for ngo events

[mrsaicharan1]

Part of #5991

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

• All the functions created/modified in this PR contain relevant docstrings.

Short description of what this resolves:

• Adds fields in schemas and models for NGO events
• Added migration

Changes proposed in this pull request:

• Added migration
• Modified fields

[iamareebjamal]

nullable=False

[mrsaicharan1]

RC

Updated 👍

[iamareebjamal]

RC

[iamareebjamal]

The migration will fail

[mrsaicharan1]

The migration will fail

Is it essential to mention nullable=False in SQLAlchemy model as well?

[iamareebjamal]

Yes, but not related to migration. The migration will fail because default value is not supplied in the migration

[codecov]

Codecov Report

Merging #5995 into development will increase coverage by <.01%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           development    #5995      +/-   ##
===============================================
+ Coverage        66.28%   66.28%   +<.01%     
===============================================
  Files              285      285              
  Lines            13992    13995       +3     
===============================================
+ Hits              9274     9277       +3     
  Misses            4718     4718

Impacted Files	Coverage Δ
app/api/schema/events.py	89.93% <100%> (+0.06%)	⬆️
app/models/event.py	81.92% <100%> (+0.14%)	⬆️

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