I'm nearing the end of a campaign, based off the movie knowing.

Essentially my group finds an envelope of numbers telling them the date, time, type, and location of each attack. Currently my players have gone through all attacks and knows the final assault is 7 days away, and its going to be big(mostly cause they know I'm very consistent with my campaigns). Any ideas on how to make it BIIIIIIIIGGGGGGG. And dangerous, dont forget dangerous??????