I'm stumped by the fact that R/Hr trounced H/G though. I thought there was more H/G affinity in fandom than R/Hr, even among canon-lovers, but apparently not.

hg_seasonfest is taking place now so some H/G people probably focused more on that. But hp_canon_fest skews more toward R/Hr because the mods are R/Hr people, as is most of their flist, and they did more pimping of the fest in R/Hr comms and websites like Checkmated.

I don't think the fest was mentioned at all in other communities aside from the ones mentioned in the profile, and all but two(?) are skewed towards Weasley pairings.