It seems like you are using the form in an iframe. If so then simply go to the code and adjust the height to a larger number. The IFRAME code has a "Width" and a "Height" directive. See below:
HTML Code:
<iframe src="https://clicknpledgedemo.secure.force.com/default/cnp_paas_evt__ExternalRegistrationPage?event_id=a17o0000000Wj2IAAS&WidgetType=RegistrationWidget" align="top" height="900" width="960" frameborder="0"></iframe>
You may change to that height="1200" or any other number you want. One cannot autosize this parameter so you need to adjust it based on your event levels, etc.
Try it and let us know.
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