SGA from Reddit- Spider's got what you need. (Destiny)
by Korny 
, Dalton, Ga. US. Earth, Sol System, Wednesday, February 12, 2020, 14:12 (1753 days ago)
Spider is selling Simulation Seeds for legendary shards, and is selling glimmer for Simulation Seeds. "Best time to buy Light Fused Fractaline."
SGA from Reddit- Crimson Days Sparrows Unlock Emblem
by Pyromancy , discovering fire every week, Thursday, February 13, 2020, 15:43 (1752 days ago) @ Korny
edited by Pyromancy, Thursday, February 13, 2020, 15:48
There is an Event Exclusive Emblem, called "In The Valley", that can be unlocked via Bungie Rewards website once you trade Shaxx 100 Confectionery Hearts for 2 new Event specific Sparrows.
The deadline is February 18, and unlock includes a bonus Emblem code for a friend.
Reddit.com | If you buy both Crimson Days sparrows from Shaxx...
I don't think this has been otherwise communicated and the redemption window appears to be only 1 week long.
P.S. There are also, hidden Triumphs that can be achieved during battle in the Crimson Days event