can someone help me trigger the Northcrest event, I can't seem to continue it
I think Tao's homecoming is probably not relevant. Have you tried talking to NPCs other than the weapon shop in Northcrest (including areas other than the market), completing missions, and walking around at different times and days of the week? Maybe it's because of its low reputation in Northcrest.
Requires repeated missions from Alden, Quartermaster of Northcrest. In order to meet him, you must complete Everett-related missions in the Garrison. You'll also need to advance Orc war missions to get Korg and Everett to talk to each other in the RiverBank, as well as be friends with Feliar and Everett. At the same time, it is necessary to deepen your friendship with the NPCs in the town of Northcrest and fulfill their requests.