Short sets of coordinates for ease of use, more details are below. Be sure to copy and paste it as provided by blocks to avoid confusion!
After taking Festive Reflections:
/way #71 61.00 50.72 Athelton Jones (speak)
/way #71 63.80 51.76 Jepetto Joybuzz
/way #71 63.02 49.85 Big Kinook
/way #71 62.98 49.16 Reshad 63.04 49.24 (on top of the stage)
/way #71 61.90 49.90 Maru
/way #71 61.65 51.04 Lorewalker Cho
/way #71 61.00 50.72 Athelton Jones
/way #71 61.86 50.42 Shademaster Kiryn
/way #71 61.99 50.09 Petra
/way #71 62.17 49.67 Jepetto Joybuzz
/way #71 62.83 49.34 Vanni Thorngage
/way #71 62.85 49.41 Scalecommander Emberthal
/way #71 62.98 49.16 Koltira Deathweaver
/way #71 63.01 49.20 Lord Thassarian
/way #71 62.98 49.65 Moira Thaurissan
/way #71 64.11 51.12 Vorkan Thunderbrow
/way #71 64.14 51.18 Grimkel
/way #71 61.00 50.72 Athelton Jones
/way #71 60.92 44.74 Bonenose
/way #71 65.81 41.76 Athelton Jones
/way #71 66.21 40.93 Alyx
After taking quest Festive Reflections from [npc=232410] you have to complete quest by speaking with [npc=226796]
/way #71 61.00 50.72 Athelton Jones
He will give you next quest A Surprising Investigation rewarding 8x[currency=3100]
Waypoints for 5 imposters:
/way #71 63.80 51.76 Jepetto Joybuzz
/way #71 63.02 49.85 Big Kinook
/way #71 62.98 49.16 Reshad 63.04 49.24 (on top of the stage)
/way #71 61.90 49.90 Maru
/way #71 61.65 51.04 Lorewalker Cho
Return back to Athelton Jones and speak with him to get the letters ([item=231905] will be in your bags)
/way #71 61.00 50.72 Athelton Jones
Distribute letters by using item on each of the following NPCs (you do not have to follow and go to exactly these NPCs, you can give letters to any of highlited NPCs in location)
/way #71 61.86 50.42 Shademaster Kiryn
/way #71 61.99 50.09 Petra
/way #71 62.17 49.67 Jepetto Joybuzz
/way #71 62.83 49.34 Vanni Thorngage
/way #71 62.85 49.41 Scalecommander Emberthal
/way #71 62.98 49.16 Koltira Deathweaver
/way #71 63.01 49.20 Lord Thassarian
/way #71 62.98 49.65 Moira Thaurissan
/way #71 64.11 51.12 Vorkan Thunderbrow
/way #71 64.14 51.18 Grimkel
Return back to Athelton Jones and speak with him
/way #71 61.00 50.72 Athelton Jones
Go to Bonenose and speak with him
/way #71 60.92 44.74 Bonenose
Now find the Athelton Jones here and speak with him
/way #71 65.81 41.76 Athelton Jones
Now go to Alyx (with suddenly short title!) here
/way #71 66.21 40.93 Alyx
*Thanks Pyracantha for approximate coordinates that allowed me to create this comment!