Remove Social Event Requirements

[DeadPixelPro]

Check one:

• Semantic Change: something about the meaning of the text is different
• Non-semantic Change: Spelling, grammar, or formatting changes.

Summary of change(s):
Removed the CSH Social Event requirement from both Intro Member and Voting Member expectations.

• Social event attendance is not something we track
• If you don't attend a single social event as an intro member, you're unlikely to pass anyways
• It can be confusing to an intro member as to what counts as a "Social Event"

This differs from https://github.com/ComputerScienceHouse/Constitution/pull/243/files (which failed to pass), as it removes the social event requirement from both intro and voting expectations. I believe the fact that it held upperclassmen to a different standard to intro members was the primary reason this failed.