Enquiry on Visa issuance

Hi,
I wish to know the type of visa to apply for, because I will be attending CIAAF 2012 Trade Fair between June 26th and 30th on the name of my company. Having this limited time to go, can I be issued the visa within a day or 2 days of application considering the Expedited Service of the embassy and can I do this in any day of the week? Lastly, kindly state the visa and expedited service fees in order to prepare myself. Thanks