I'm gonna go against the grain and say House of Mirrors is easier. As adorable as the egg hunt is, it's far too time consuming for anyone with a busy schedule. I feel like if the egg hunt was on the weekend before or after, it'd be more manageable to be able to participate. That's just me, though; getting older comes with more responsibilities. This year I was hosting Easter and Passover so it was a little chaotic.
The Egg Hunt in general requires more obscure forum knowledge. I felt like the clues were easier this year compared to previous years; they were
way harder. If I had more time this year, I probably would have done better. But no loss, really.
House of Mirrors may be difficult, but it's much easier to time manage. Most of the time, I get it wrong but it's always funny to see people's answers to it. It's rewarding when we get it right.
The Fair remains my favorite event, followed by Halloween and Christmas.