Whittleton Creek and Colombia are the only locations in the Trilogy which have so far been limited to one ET activation within HITMAN 3 (excluding non-applicable locations). See here for a full count by map.
Most other locations have seen three activations, aside from Paris & Hawke’s Bay with two each and Dartmoor and Mendoza with six. Whittleton Creek & Colombia both should have at least one more opportunity for those who missed them to acquire their suit rewards.