Hatching Day

The temples of Tiamat in Kundar have made a strong effort to put on their most 'public friendly' face in the establishment of the city for the sake of order (see: Narn Hundore, First Guildmaster of Tiamat). Drawing on the Dragon Queen's more matronly aspects (few though they may be), the celebration of Hatching Day has become a mainstay tradition in the local Tiamat faith.
At the eve of each new moon, all the children whose birthdays fell in the last lunar cycle gather at their local shrine or temple to Tiamat, and several priests will be there to welcome and congratulate them on another year. Colourful food is provided (it's often quite messy), and every child is given a small gift from Tiamat. All children, Kobold and Dragonborn alike, even Orc, Tabaxi or whoever are welcome in equal measure.
Naturally, it's not all just public relations on the temple's part, it's also the first steps in introducing the children to the faith. The gifts are the same for all children of each age (some simple blocks for the youngest, up to a complex stick and tile game for the eldest). The toys are designed to be genuinely good and useful - helping the education of the children along - but also seeing that the older children get better and better toys keeps the children looking forward to coming back to Tiamat's temple next year, even if they're not regular attendees.
On top of this, the children are encouraged that if they want a toy they do not have, then they should figure out what to give the other child in trade. Thus the driving tenets and ideals of Tiamat in Kundar are instilled - acquisition and manipulation. One of the last gifts they receive is a small set of wooden scales - imperfect, but functional (indeed, learning its individual bias and using it to their advantage is part of the lesson the priests hope the children learn) - and so older children will often use these to resolve disputes in swaps between the others, even if weight does not bear an actual relationship to value.
And so Hatching Day is a greatly anticipated day each month for the children, keeps local toymakers employed with mass production of these trinkets, and furthers the rising faith of Tiamat.