Some of them are partial abstinence, some are full abstinence, and some are none of the above!

I think part of the reason for the difference is that some of the Holy Days are worldwide (i.e. Christmas, Ascension), while some are country specific (i.e. Immaculate Conception, All Saints).  The country-specific holy days are made a holy day by the bishops of the country (i.e. St Patrick is a holy day in Ireland; Ephiphany is a holy day in much of South America and probably the Middle East).  I would think the vigils which are world-wide would have a full fast/abstinence and they would also be the oldest holy days of our Faith (i.e. Vigils of Christmas, Easter, Pentecost) and these feasts also USED TO have octaves of celebration afterwards.  So many, the full fast/abstinence is related to preparing for the octave of celebration?  The feasts of All Saints, All Souls and the Immaculate Conception are relatively new feasts, compared to Christmas, Easter and Pentecost.

Also, one wonders why the feast of the Annunciation is not a holy day?  I think it was Anne Catherine Emerich who explained the marvelous importance of March 25:
1.  The sixth day of creation, when God created Adam
2.  The actual day of the Annunciation
3.  The day of Good Friday
4.  ...I think there was one more connection to the Old Testament, either Abraham or Moses...
5.  Dante picked this day to begin his 'Divine Comedy' story
6.  Tolkien picked this day specificially as the day when the One Ring was destroyed (obvious parallel to Good Friday)

Anyway, the Church knows best and things happen in God's time but I wouldn't be surprised if this was made a Holy Day in the future.

Also, one wonders why the feast of the Annunciation is not a holy day?  I think it was Anne Catherine Emerich who explained the marvelous importance of March 25:
1.  The sixth day of creation, when God created Adam

This is an interesting assertion.  The world was created on March 20?  How do we know this?

I am all for more fasting and abstinence. If it were up to me I would increase the amount of fasting and abstinence required of Catholics.

Adam was created on March 25th according to Anne Catherine Emerich (I think it was her.  Might have been another mystic).

Interesting.  I am, at best, quite skeptical of this.  Anything information you can provide would be helpful.

Looking at each of my Trad (1962, pre-Vatican II) Catholic calendars, none of them has Halloween marked as a fast/abstinence day as the vigil of All Saints Day.

This isn't a Novus Ordo calendar. It has all the Fridays marked full abstinence, each day of Lent is a day of Fast, the vigil of Pentecost is marked as a partial fast/abstinence day, the Ember Days are all marked (Fast and partial abstinence on Weds, Sat; Fast and full abstinence on Fri), Vigil of the Immac. Conception is marked full fast/abstinence.

It would seem that there is a hierarchy to Trad fasting/abstinence.

None at all = you're Novus Ordo
You "try to remember" to not eat meat on Fridays during Lent = still Novus Ordo
No meat on Fridays = average Trad
No meat on Fridays and practice the Ember days = serious Trad

But then even the VIGILS seem to have a hierarchy among them. Some of them are partial abstinence, some are full abstinence, and some are none of the above!
In fact, I just saw on one calendar that CHRISTMAS EVE is a full fast/abstinence day -- even though it falls on a Sunday this year! That has to be a mistake. One should never fast on Sunday. I'll have to look at my other calendars.

Also, on this note, I know that even at the Seminary there was some disagreement/surprise about which days we were supposed to fast on. The whole "Feasting and Fasting at the same time" thing.

are there any "average "trads here that would not follow the ember days fasting? I would be surprised as it doesn't make sense

But if you take that rule into practice today, how would you go about finding out what the rule is for a given area? Which bishop do you pay attention to? In L.A. we have no more Ascension Thursday because Roger Balony moved it to the following Sunday, and the same for August 15th, the Assumption, moved to the nearest Sunday.

I had no idea you were still novus ordo, sorry about that!