The companies which organize these consumer trade fairs like Kharedi Yatra are fairly large and hold these consumer fairs in all major towns in Goa . Usually after every 3 months, they will hold the fair in the same town.
For those who cannot afford to spend so much, the other option is to take a hall on rent for a limited period of time. In panaji, due to the low population, there are many shops which are closed, as there are few who can afford to pay the rent. So some shop owners are holding exhibitions
There are some organizations which are offering the hall on rent for Rs 500 a day in panaji, goa which is centrally located and close to the government offices. However the hall should be booked for a minimum duration of 5 days.