So for me the daily special is the most important thing (I don't care about Horror Circuit, its terrible and I won't bother with it or the calendar).
I'm stunned with the lack of daily pumpkins showing up... tons of light bulbs, teddy bears and other such things. I burned through about 1600 tickets with a daily house of horrors prize and never got a single daily special! Make more daily special items pop up please...too many blank fogs.
It's been this way for Hallowe'en and Archaeology for a while (I'm not sure it was the first year). It's not been a huge problem for Hallowe'en because the grand prize the last two years has been amazing. Though last year I made the note to guildmates not to get their hopes up at finishing additional Asylums because the special rate is abysmal.
Most events aim to let you take home about 10 specials worth with the free currency, and additional specials for 1000-1500 diamonds each on average. There's a few that are really good for specials, and then there's Hallowe'en, Archaeology, and St Patrick's that are abysmal for them (maybe 5ish and >2k diamonds per additional special).
I do wish they'd either make pumpkins more common or improve their special %. But if not I'm ok with that too ultimately. Events are basically free stuff, and there's so many of them nowadays that if there's an event with an uninspiring grand prize and poor chance at winning useful specials, an event off is not unwelcome.
Probably won't decide til it goes to live whether I play it or skip it. I've never tried a digging event where I ignore the grand prize entirely - might be worth a crack to see how much further you can stretch your tools by treating lightbulbs as empty squares.