On Saba Saba, the city of Dar es Salaam hosts the Saba Saba International Trade Fair. Companies, farmers, craftspeople and inventors from all over Tanzania - and other countries too - bring their products to show off. There are tents full of fruit, fabric, machinery, books, foods to taste and crafts to buy. Schools sometimes take pupils on trips to see it.
All over the country, people use Saba Saba as a day for parades, music, sports matches and family meals. Many Tanzanians wear clothes in their national colours: green, yellow, blue and black, the four colours of the Tanzanian flag. Kids often get a day off school and go with families to eat together.
Tanzania also has another big national day called Mwaka Kogwa, celebrated in Zanzibar around July or August. 'Mwaka Kogwa' means 'washing the year' in Swahili. Villagers light a fire from old grass to symbolise burning away any bad luck from the past year. After the fire, there is feasting, music and dancing late into the night.
Holidays like Saba Saba and Mwaka Kogwa are how Tanzania makes time to look at itself in the mirror and celebrate. It is a country with many languages, many traditions and many landscapes, and shared festivals are one of the ways it all feels like one big family.