The Angaran Initiative
Location: Aya
This one starts when you visit the Initiative Embassy on Aya. Tann sends you an email about it, but you don't have to read the mail before strolling in.
Find the embassy in Governor's Office- south door.
Talk to Rialla, she'll educate you about local troubles, including a Salarian who thinks an Angaran threatened his life (launching sidequest The Vesaal) and some Angarans undecided about living onboard the Nexus (launching sidequest The Nexus Exchange). Finishing your conversation with Rialla completes this mission.