Questions & Answers about Ovaj vikend ću biti ovde.
Both can be used, but they are not exactly the same in feel.
- ovaj vikend is very common for saying this weekend as a time expression.
- ovog vikenda is also possible and often feels a bit more explicitly temporal, like during this weekend.
In this sentence, ovaj vikend is functioning as a time phrase meaning this weekend / over the weekend.
Also note the grammar:
- vikend is a masculine inanimate noun
- for masculine inanimate nouns, nominative and accusative singular look the same
- so ovaj vikend can serve as a time expression without changing the form
ću biti is the future tense.
Serbian future tense is commonly made with:
- a form of hteti (ću, ćeš, će, ćemo, ćete, će)
- plus the infinitive of the main verb
Here:
- ću = I will
- biti = to be
So:
- ću biti = I will be