For the good-folk whirl within it,
And they pull you by the hand,
And they push you on the shoulder,
Till you move to their command.
— from The Wind on the Hills, by Dora Sigerson Shorter
Perhaps some reading my words feel I am being overly cautious or even negative in my advice about your alliances with the People of Peace. But our ancestors lived much closer to the land than we do, and their encounters with the Good Folk were nothing like the Disney-ish, commercialized stories that we find today. All the sparkly, glittery, sweet pixie images aside, the fact is that our forebears spent a lot more time and energy finding ways to ward off attention from the Gentry than attempting to invite it.
In other words, many of the ideas I am suggesting here run absolutely counter to what prior generations would have thought prudent. Some of that fear was certainly imposed by the Church, eager to turn all vestiges of Pagan and old magical beliefs into evil and devilry. That distortion was certainly exaggerated in most cases. Most, but not all, I daresay.
In any case, I believe that now is the time to repair the old difficulties between our worlds, as much as possible. But make no mistake, this is a delicate business, and good intentions alone will not protect you from possible misfortune. Solid knowledge and respect for the power of these ancient races is required.
Which is precisely why I am discussing this under the auspices of the Goddess Thalia, Grace of flowering and mirth. With Her guidance and blessing, I believe that tolerance, good humor, and blossoming understanding can prevail. If you feel comfortable doing so, I would urge that you invoke Her presence as you proceed.
So what are some don’ts? First, let me emphasize again that any object that may contain iron is absolutely out. The theories behind this vary. Perhaps it is due to the fact that it was the metal-wielding invaders who drove the Tuatha Dé Danann into the hollow hills. Or it may have to do with the iron that runs in the blood of humans, so there is a magical taboo of some sort related to this.
And remember that money, unless it is exceptionally beautiful, is a gray area that has the potential to offend, so I would personally steer clear of using it, at least until you know your own Good Folk well.
Some lore, though, is quite contradictory. For more about that, stay tuned!