As I said, unless you or one of your friends speaks to the organizers in detail...
You can tell I'm still a bit sore about it! But it will pass; time, marathons, and encuentros will heal my papercuts.
Are you "transparent" when you refuse a dance partner, for a tanda, but for example also one who would like to accompany you to an event?
Ah, I realise that I should have phrased it differently. Not quite "transparent", but more of that if they have stated their method of selecting dancers, it should be clear what exactly that entails (for example, Martin was quite clear about how he selects the dancers, balancing roles and compatible dance levels. Dance levels are quite subjective anyway, so it's fine). If it involves giving (some) priority to people who have participated there before, or are known, then I believe it should be explicitly stated to be fair.
I keep my intentions for inviting a follower to myself, and I never ask a follower to explain why she will not dance with me; I never speak about it unless she brings it up first. In the same way, I will not explain even if asked, unless it is a friend I can be candid with.
If a dance partner would like to me to go with them to an event, I would assume that it is because we both enjoy dancing together very much, and that they have seen positive indications that I do actually enjoying dancing with them, instead of merely dancing with them out of obligation. If they have somehow progressed to the point that they really enjoy dancing with me when I don't enjoy dancing with them enough, well, I'd be flattered, but I'd also find some excuse if possible. I don't want to hurt people unless necessary.
(I'm assuming that in the second case, you mean a partner who
herself would like to accompany me to an event, not a partner whom
I would like to go together with to an event. In that case, my regular dance partners know I am selective about the music I dance with them to, so there are no hard feelings).