Actually, spots made on the parking lots of car shows (e.g. Geneva Motorshow, IAA Frankfurt, Auto RAI) and of car exhibitions are accepted on Autogespot, as long as the pictures are taken outside of the event's area (i.e. where you typically have to pay an entrance fee, e.g. a building) — and of course as long as it's not on a circuit.
However, spots made on the parking lots of other events such as the start of a rally are not accepted for some reason. It's sometimes even forbidden to spot in a whole town when there's a major event in it, e.g. the Zoute Grand Prix in Knokke-Heist (Belgium) recently. Honestly I don't know the motivation between this (unwritten!) rule. Maybe Jeroen could help us clarify the situation, if he reads this.