Which of the following companies does G like ?

The one who likes TCS attend the workshop in a month having less than 30 days, i.e. either in April or in Sept.

Lets consider the case when the person liking TCS attends the workshop in Sept.
Since B and the one liking TCS has only one person between them and H attends workshop immediately after B, thus H would attend workshop in august.
Now 3 people are there between H and G, thus G would need to attend the workshop in January, hence him being the first one to attend an workshop, which contradicts the fact that the one liking Infosys attends prior to G. Hence this case is not possible.


Lets thus take the case in which the one liking TCS attends the workshop in April :-
Only 1 person attends the workshop between the one liking TCS and B, hence B can either attend in Jan or in August. Now since the one liking HTC will attend the workshop immediately before B, hence B has to attend in August. This would mean the one liking HTC would attend in July.
Now only 3 people have attended the workshop between the one liking TCS and the one liking Nokia, hence the one liking Nokia would have attended the workshop in December.

Now,
H will attend immediately after B i.e. in Sept.
Only 3 persons will attend between H and G, hence G will attend in March.
The one who likes Infosys will attend immediately before G, hence the one who likes Infosys will attend in January.

The one who likes Samsung attends immediately before Godrej, hence B would be the one liking Samsung and the one liking Godrej would attend in September.
E attends immediately after the one who likes Godrej, hence E is the one who likes Nokia.

C will attend the workshop in a month having 30 days, i.e. April. Thus C is the one who likes TCS.
F doesn't likes HTC, thus F would like Infosys.
The final arrangement would look like :-

D likes BlackBerry.