It would be nice if there was some type of event that would double the harvest on alchemy reagents from the fauna sources.
Am I forgetting any?
When they do double node events, such as all the nodes in Wrothgar right now, the above-mentioned sources are exempted and it would be nice to have them included in such events. Like OP suggests, the Witches Festival would be a perfect event to implement this as it fits the theme of creepy, crawly stuff.
Outside of spider eggs and fleshfly larva (which comes from multiple sources) the above-listed reagents tend to be my lowest in quantity, especially since they are not guaranteed drops when "harvesting" one of these sources. I would be satisfied if, instead of doubling the output, they upped the harvest rate to 100% success rate.
Feric51 Xbox NA
Darkness Falls: The Crusade survivor (you young kids will never know the struggle of text-based games)
"May you walk on warm sands."
"First, I would ask that you look to the poor and the suffering around Cyrodiil. Look into their hearts, and then look into your own."
"May Auri-El's light guide you in your darkest hours."
I didn't figure out that the flying things you could select would randomly give alchemy stuff as well. A bit annoying and I have more than enough fishing stuff now, but I am no longer so tight on Butterfly Wings and Torchbug Thoraxes.