Learn Turkish: Hafta sonu sinemaya gidiyoruz. - We are going to the cinema at the weekend.

Just like in English ('We are going to the cinema this weekend'), Turkish often uses the present continuous tense (-iyor) to talk about fixed future plans or arrangements.

The dictionary says the verb 'to go' is gitmek. Why is it spelled with a d in gidiyoruz?

This is because of consonant mutation. When the verb root git- gets a suffix that starts with a vowel (like the -i in -iyor), the hard t softens to a d. You will also see this happen with etmek (to do).

Why is there a y in sinemaya?

The word for cinema is sinema, and the suffix meaning 'to' is -a. Because Turkish avoids putting two vowels right next to each other, it inserts the buffer letter y between them, making it sinemaya.

Where is the word for 'at' or 'on' in hafta sonu?

You do not need one! While English says 'at the weekend' or 'on the weekend', Turkish just uses the phrase hafta sonu (literally 'week end') by itself to show when the action is happening.