Need ideas for a Celtic themed Medieval or Renaissance wedding?

The Knot, of all places, has a nice list of helpful links! There are various explanations for traditions and tartans, links to helpful sites, and music ideas. There are also some lovely poems and vow ideas such as:

I vow you the first cut of my meat, the first sip of my wine,

from this day it shall only your name I cry out in the night

and into your eyes that I smile each morning;

I shall be a shield for you back as you are for mine,

no shall a grievous word be spoken about us,

for our marriage is sacred between us and no stranger shall hear my grievance.

Above and beyond this, I will cherish and honor you through this life

and into the next.