Day of Fertility

The Day of Fertility falls on the spring equinox every year. It is a communal celebration, marked by feasts and festivities, that indicates the passing of another year and the new life that new year will bring. People in Shindus do not celebrate individual birthdays and track their age by how many Days of Fertility they have witnessed, rather than how many birthdays they have had. 
Like many other Shindusian holidays, Brittle Berries play a prominent role in the cuisine of the Day of Fertility, with pastries and porridge being commonplace. However, they are not actually the main focus. Shift Grain, a species of grain brought to the Shindus valley by the first settlers when they fled old Dujuku and the Starfall, is actually the main focus. It grows very poorly in the soil of the Shindus valley, but it is still able to be cultivated in small amounts, which are generally reserved for this celebration. It is traditional for everybody to eat a singular piece of Shift Grain flatbread followed by a Brittle Berry dish to signify the ever changing nature of life and the necessity of being able to adapt.
And although the celebration is for everyone, there are also traditions surrounding those who are turning certain ages that year. The most important ones are 1 and 15, as someone's first Day of Fertility is a big event because it means they have survived their first year, and 15 is considered to be the legal age of adulthood in Shindus, so it signifies a coming of age for young adults. The specific way that 15 year olds are celebrated varies by location, but they will almost always be part of a central ritual, such as a parade or dance, in which they start alongside younger members of the community and end alongside adults. Otherwise, 25 and 50 are the only other major ones because they signify big benchmarks in the course of a century. They will usually be acknowledged and celebrated with a toast or some other small ritual, but it is practically never as big as the coming of age ritual.