"We have some more coming up in Istanbul and Imola. It keeps up the competition for a place for one of the 22 slots on the calendar and I think it would be good to have some sort of invitation race once a year to take in these different tracks."
Formula 1 returns from its week off this weekend at Sochi, a track that has historically suited Mercedes.
But Horner remains hopeful his team can pressurise the championship leaders enough to make things uncomfortable at the front.
"I expect Mercedes to be fired up and pretty dominant as [Sochi] is their type of track," he added.
"But as we have seen this season tyre degradation is an interesting factor. They weren't stretched last weekend but you could hear how nervous they were, instructing their drivers to stay off the kerbs.
"So, it would be great if we can be competitive in Sochi and put them under a little bit of pressure because that is when things can happen."
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