The best place that I know to farm Engrams is on Venus next to the crashed ship. You get there by continuing through the multileveled'"library" where you first meet the Stranger.
There are multiple spawn groups of Fallen and Vex. If you happen to kill all enemies, more should spawn in under 10 seconds. As an added bonus, randomly the messenger on the bottom left will say some thing along the lines of
"Enemy forces are getting ready for a big battle"
This is when it gets real. There are so many enemies that being a high level won't be enough to keep yourself alive.
Location: Earth
Nickname: "Loot Cave "
This area has Fallen and Hive enemies. Go to patrol and find the area with the old Russian helicopters. Kill all the enemies, then back away from the cave where the Hive spawn. Hive will continuously spawn as long as you are not close to the cave. (Unconfirmed by me.)
Credit to' The Snus Fairy'
If you know of any other areas like this, comment below, and I will add them after I verify it. If you can give the exact location your ghost gives you, it would be much appreciated. Thanks for reading!
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Christmas noob much? This area is played out like the loot cave...
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Roc Strikes, i average about 6 a strike
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Another good spot for "enemy forces gathering against each other" is the area on Earth where the old loot cave was if you go to the top right where you grab the three dead ghosts for the one story mission, once the majors and ultras wave starts spawning you can Super/rocket the shit of of that cave forever until you run out of ammo or orbs. Did this with two buddies and our haul was pretty tremendous and we maxed out glimmer by the end of it