Thank you ManicDee. Works great. But, at least for me, was not working if the Calendar app was not opened. Duplicating the "activate" line solves the problem. Full code I am using is:
tell application "Calendar" to activate
set the clipboard to "{query}" as text
tell application "Calendar" to activate
tell application "System Events"
keystroke "n" using {command down}
keystroke "v" using {command down}
keystroke return
end tell
Thanks again!