1. Turkic clothing, hairstyles, mustaches headwears... especially the usage of colour turquoise in clothing. It's the colour of Turks dating all the way back to GokTurks. Timur the lame knowing this made palaces using that colour.
2. Turkic names because some still use Muslim names despite being Tengrists.
3. Events related to Dede Korkut stories and Turkic legends like Ashina the Grey Wolf where you can be taken care of by a female wolf and gain abilities from that could be cool. In fact, having a cultural tradition "Wolf-blooded" since it's a belief that all of Turkic people come from that wolf and that little young boy she took care of...yeah, they had babies together which made nowadays Turks, anyway. Another one could be Ergenekon where if your empire/khanate is crumbling, you get an event to escape into a mountain as your last resort with your people and start living there in an adventurer gamemode. But in the end, you split the mountain in half after regaining your army's strength to retake what's yours.
A quote from Wikipedia about tughs and the importance of Ashina (the she-wolf):
Chinese observers stated that the medieval
Göktürks displayed a tuğ decorated with a wolf's head at their camp's gate in order not to forget their origin from a she-wolf ancestress.
[10][11]
Something based on real life would be a Kürşat event, if you are raiding to kill an emperor, you get this event while raiding the palace because in real life, Kürşat actually attempted to kill/assassinate the Chinese emperor with his only 40 men but failed. Maybe this could be added when China is introduced into the game and if you, as a Turkic nomad, are raiding the empire's capital, you could trigger this event. Even events related to Kangal dogs, which were brought to Anatolia by nomadic Turks and are still genetically close to Central Asian dogs to this day, could be added, along with other key figures of Turkic mythologies/events.
4. Decisions to form the Xiongnu, Göktürk Khaganate, or unite all the Turks.
5. Adding Turkic military units.
6. Tengrist ceremonies like Uçmağ (afterlife beliefs), the placement of balbals/kurgans (stone monuments for fallen warriors) and the tradition of leaving runic inscriptions just like Orkhun inscriptions.
(Actually, a rework on pagan religions would be a delight in all because while Tengri is the sky god, there were other gods and goddesses as well like Umay. When a child is born you bless Tengri but you could also bless Umay for that reason.)
8. Adding the Kut/Qut belief and the importance of the Orkhon Valley/holy mountains of Ötüken, making it essential for Turks to conquer Ötüken. There's more to Ötüken than just being a sacred city for Tengrists or nomads. It was the capital of many khanates for a reason. I will quote from an essay, "Some Thoughts on Ötükän":
"In history, all Altaic nomadic powers fought to set their capitals there, such as the Hun (209 BC – 93 AD) capital LuutKhot, the Xianbei (93 AD - 234 AD) capital Ordo, the Rouran (330-555) capital Mumo, the Turk (522 - 744) capital Ötükän, the Uyghur (744-840) capital OrduBalïq, and the Mongol (1206 - 1368) capital Kharkhorin—all of which are in OVCL (Orkhon Valley Cultural Landscape)."
From Wikipedia about Orkhon Valley:
Moreover, a force called
kut was believed to emanate from this mountain, granting the khagan the divine right to rule the Turkic tribes.
[2] Whoever controlled this valley was considered heavenly appointed leader of the Turks and could rally the tribes. Thus control of the Orkhon Valley was of the utmost strategic importance for every Turkic state. Historically every Turkic capital (
Ördü) was located here for this exact reason.
According to the Orkhon Inscriptions, when the Gokturks lost their hold over the Ötüken forest, they could no longer receive or wield the kut and the Turkic world plunged into darkness.
9. Here's a quote about Turks from the book Ibn Fadlan And The Land Of Darkness, Arab Travellers In The Far North Penguin Classics Copie to make a punishment event, if you will.
Adultery is unknown, but if they learn that someone has committed an act of that kind, they split him in two in the following way: they bend down the branches of two trees, tie him to the branches and let the trees spring back into their original position. Thus the man who has been tied to the two trees is split in two.
Here's another quote about Turks and their facial hair from that book:
All Turks pluck their beards, but not their moustaches. I once saw a very aged man, who had pulled out his beard, but left a tuft under his chin. He was wearing a kind of goatskin cloak, so that from a distance he looked exactly like a billy goat.
10. When the Silk Road is added, consider the Turks' role as blacksmith, could be a Turkic tradition even. A quote from ChinaKnowledge.de -An Encyclopaedia on Chinese History, Literature and Art:
In that area, the Türks were surrounded by the "nine tribes" of the
Tölöš (Jiuxing Tiele 九姓鐵勒), but were subjects of the steppe federation of the
Rouran 柔然. The Rouran called the Türks
duan-nu 鍛奴, which meant "ironsmith
slaves". At the beginning of the 6th century, when the Rouran empire began to disintegrate, the Türks again moved south, and under the chieftain Tu-men 土門, they started to develop trade relations with the Chinese border regions. From 545 on, North China and the Türks had regular relations. These trade relations perhaps contributed to their economical and then also political rise.
From Wikipedia:
Although the ancient Turks were
nomadic, they traded wool, leather, carpets, and horses for grain, silk, wood, and vegetables, and also had large ironworking stations in the south of the
Altai Mountains during the 600s CE.
11. Turkic throne. There's one example of a Khan sitting on a throne with 2 horses.
12. From Wikipedia, Irk Bitig, regarding the travel events (because we get omen events duh), some parts of this book from 9th century could be helpful for you developers (there contents at the end of the page):
Irk Bitig or
Irq Bitig (
Old Turkic: ), known as the
Book of Omens or
Book of Divination in English, is a 9th-century manuscript book on
divination
I may even open a thread myself with all these ideas. I will continue to think more
13. Turkic specific celebrations and festivals
Nardoqan (a holiday similar in both timing and concept—celebrating the birth of the sun—to Yalda Night)
Paqtaqan (an autumn feast and festival)
Paynaqan (a winter feast and festival)
Sayaqan (a summer feast and festival)
Qochaqan (a ceremony for blessing, fertility, and abundance).