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1. Every summer from June until July something wonderful happens in St.Perersburg.
2. Visitors from all over the world travel to the city to see this.
3. A visit to St.Perersburg during that time is a fantastic experience.

1. Every summer from June until July something wonderful happens in St.Petersburg.

(?) Does something wonderful happen in St.Petersburg every summer from June until July?

(-)  Nothing wonderful happens in St.Petersburg every summer from June until July.

2. Visitors from all over the world travel to the city to see this.

(?) Do visitors from all over the world travel to the city to see this?

(-) Visitors from all over the world don't travel to the city to see this.

3. A visit to St.Perersburg during that time is a fantastic experience.

(?) Is a visit to St.Perersburg during that time a fantastic experience?

(-)  A visit to St.Perersburg during that time isn't a fantastic experience.