I only have 3 wind SRs, and a meh thunder team, so my will to drop time on this event is very low (I've barely done enough to get the two elixirs a day). Probably for the best, because I usually end up going all out on the raid events which I find more fun and would burn out quickly.
3 wind srs, 2 light (not lightning), and 2 SSRs and 4 SRs for fire and dark each.
I think I know which events I focus on >.>