Using the Preposition "На" for Events
When Russians talk about events — that is, organized occasions such as a play, concert, exhibition, excursion, lesson, or lecture - they also use the preposition "на" (at / on):
на спекта́кле - at a play
на конце́рте - at a concert
на вы́ставке - at an exhibition
на экску́рсии - on an excursion
and so on.
Past Tense in Russian
Here, Mark talks about events that happened to him over the past week, which is why he uses the past tense. To form the past tense, the suffix "-Л" (plus gender/number endings) is typically used:
фотографи́ровал - took photographs
быть: был, была́, бы́ло, бы́ли - to be: was, were
In the Russian past tense, verbs change according to gender (masculine, feminine, neuter) in the singular, and by number (singular and plural), rather than by person (I, you, he, etc.).