This will depend on where you come from. In many countries weddings are performed in the churches and we do not need tents for such occasion, elsewhere weddings are performed in Temples and we don't need tents, but in some places in Africa, weddings are performed in homes, hotels so there will be the possibility of renting tents and chairs for your guests. In Africa some people's business is to rent out tents and chairs, so if you need them for a special occasion you can rent them there.