Here's the plan I have adopted for the use of Eucharistic Prayer I, the Roman Canon. I use Eucharistic Prayer I:
1. On any day for which it provides proper Communicantes and/or Hanc Igitur, excepting nuptial Masses. (Though I would certainly oblige if a bride asked for the Roman Canon.) This amounts to Christmas and Easter and their octaves, Epiphany, Holy Thursday, Ascension, and Pentecost.
2. On the feast of any saint who is named in it, excepting feasts of Our Lady, as she is named in every Eucharistic Prayer.
3. On any feast that has a particularly Roman character, e.g. The Chair of Peter, the dedication of the Lateran, etc.
All together this makes for something like twelve percent of the whole liturgical year.
Well, lately I have made an adjustment. I have included nuptial Masses among those for which I use Eucharistic Prayer I, because of the proper Hanc Igitur. It's not found on the bottom of the page like the others, though, so you have to do a little sacramentary hacking:
I'm very proud of my rubric-red paperclip. I'm such a geek.
Check out the original post here.