Hmmmm...on the road, no nature required, ritual for Imbolc...
Well, Brigid is the primary diety associated with Imbolc (at least for me...I know other's have different associatations). Grabbed quickly from Wikipedia:
|She was the goddess of all things perceived to be of relatively high dimensions such as high-rising flames, highlands, hill-forts and upland areas; and of activities and states conceived as psychologically lofty and elevated, such as wisdom, excellence, perfection, high intelligence, poetic eloquence, craftsmanship (especially blacksmithing), healing ability, druidic knowledge and skill in warfare. In the living traditions, whether seen as goddess or saint, she is largely associated with the home and hearth and is a favorite of both Pagans and Christians.
True, the well blessings and seed sprouting might be tough to do on the road (or in the air) but Brigid has other attributes and there are other aspects to Imbolc. As a goddess of "lofty" places and metalurgy, an airport might actually make sense for a ritual of Brigid!
Let's see, if you go with the "ewe's milk" translation, and take into account Brigid's role as poet,...perhaps pack a lunch of sheep's milk cheese or yogurt and some crusty bread, maybe some potato salad with corn mixed in (potatoes for Ireland, corn to represent the corn dolly traditionally made on Brigid's day), a salad with sprouts or young greens (maybe dandelion or nettle if you can find them), and eat lunch while reading aloud from a selection of poetry?
Or write your own poems based on the things you see while you travel? Brigid's Day is often a time for forcasting the weather and the shape of the year so perhaps as you travel keep an eye out for "portents" and craft a poem that includes all of the signs you see? Kids could have a lot of fun with that.
Errr...if you're traveling by road maybe bring a candle or two and have a "candle light picnic" when you stop for lunch? On a plane that wouldn't be such a good idea
but you could again spin Brigid's role as crafter/fire goddess and use something like an LED to represent the flame (like those little toys balls you see at rest stops that light up when you bounce them?) or use a small travel reading light with some colored tissue paper (so the light is under the paper and looks like flame). Light your "fire", nibble your ewe's milk, and read a few poems...then keep an eye out for those signs that will guide you in the creation of your own poem gift.
Later on you might make a candle and carve the poem you wrote (or a line from one you read) into the wax, or craft something out of wire (back to the "blacksmith" energy) for your garden that still reflects the travel you took and your safe return (so a bird to represent the plane, or a flame to represent the internal combustion engion that carried you, or whatever).
But that's off the top of my head, and may not appeal to everyone since lot's of mamas have a different feel for Imbolc (or Brigid).