Revert "Add tests for event methods"

This reverts commit 2e0a2c2f280fe70888d5bd818defe86c7491f4d2.
Revert "Implement Event Is{Literal,Start,End} methods"

Making the user to check for each event themselves makes everything
a bit more explicit.

This reverts commit e1e4b3b50aa74be9cb9c422964974f923eb7eb90.