Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
On how many different dates was event 1 Suspension Bridge?

### Inputs:
table_name: table, columns: ['Episode Number', 'Air Date', 'Event 1', 'Event 2', 'Event 3', 'Event 4']

### Response:
SELECT COUNT Air Date FROM table WHERE Event 1 = Suspension Bridge