Its always either coin generating buildings or passenger generating buildings that seem to be the Event prizes.... 
How about offering buildings as rewards for completing the events that:

	
			
			
How about offering buildings as rewards for completing the events that:
- produce aircraft flight items.
 - produce daily collectables.
 - increase productivity of production buildings within a one square radius by 100%
 - increase warehouse capacity by 50% (remember you oldies - many of us suffer the 100 item limit).
 - increase the maximum number of passenger buildings by one (from 6 to 7)
 - increase the production of oil refineries by 25%
 - clean up pollution at the airport and increase hanger capacity by one.
 

			
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