The tasks used for the linguistics olympiad are generally stand-alone, i.e. for their solution, the contestant does not need to be familiar with the language on which the problem is set.
[1] The municipal round of the olympiad takes place in schools and the marking is done by the local organisers.
[2] The second round of the olympiad takes place in the regional cities at the same time, usually on a Saturday or Sunday at the end of March or the beginning of April.
The marking of the scripts happens on-site and the results are announced at the official ceremony, at which awards and certificates are handed out.
[4] The top scorers proceed to a follow-up competition, to be selected for the national team of Bulgaria in the International Linguistics Olympiad.