I just did various nodes at the 30 AP difficulty (because I'm weak), and wound up inadvertently completing all the missions on the same day that they came out. If you want to see which node works for each type of gem, then this is a good place: https://grandorder.gamepress.gg/summer-2018-free-quests-part-2
After skimming that list, I don't see where I would have gotten my rider gems, so I assume it was from some of the actual event quests or something. But the other types of gems can all be obtained from the various nodes. It looks like the best APD varies between the 20 AP and 30 AP difficulty nodes.
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