I found the following link on Facebook which gives information on the open day at Graf Ignatievo on 17 MAR14.
A quick google translate includes;
Graf Ignatievo Air Base opened on March 17, 2014 from 09.30 hours on the occasion of 63 years since its establishment 10 years of Bulgaria's membership in NATO. The event will start at 10.00 hours with an official ceremony, from which visitors can watch a demonstration of the actions of the rescue crews to capture "the offending aircraft," forcing him to land at the airport Graf Igntaievo and capture the crew. Aviation greeting will be flying aircraft L-39ZA and Pilatus PC-9M of learning Aviation group "G.Benkovski" - Republic and triple attack aircraft Su-25K Base for pre-deployment - Bezmer. After continuing program of aviation friends will be able to see fighters MiG-21 and MiG-29 and enter their cabins and to get acquainted with the exposed Aviation and machinery and equipment.
I was informed that foreigners will require a visitors accreditation from the MoD.
http://aeropress-bg.com/novini/36-news/ ... tievo.html