trade fair PC 2006 - trade fair, PC 2006,
practical suggestion - if singular then use the indefinite article, if not, then use the plural
be benefited- be improved
one of the biggest computer trade fair- fairs
round the world- in
big sports hall in residential suburb- a...a
200 000- 200,000
Organisation- the
spend ages by admiring exhibition- spend ages admiring the exhibition
PS- Petr, what's your first language? Central European? You miss quite a few articles.