General :: Awk Script To Select Range From File?

I have a file generated in every event occurred. In this file i have a entries like bellow

<without blank line after Summary>

Summary: Adapter at hardware path 0/6/1/0 :Received an interrupt indicating that a
primitive was transmitted

and sometimes like bellow

<with blank line after Summary>

Summary: Adapter at hardware path 0/6/1/0 :Received an interrupt indicating that a primitive was transmitted What I need is to extract the Summary from the file. I have the following awk script. But it only works if there is no blank line after Summary.

cat server.event.txt|awk '/^Sum/,/^$/'

But I need up to second blank lines after Summary.