Your current embedding code requires that the contents of your gallery folder be copied into the same directory as teh web page containing the embedding code. The gallery files do not seem to be there.
Have you perhaps uploaded a complete gallery folder to somewhere on your web server?
If so, then you could use the baseUrl method of embedding as documented here.
Otherwise, copy the contents of your gallery folder to your 'findanevent' directory and your gallery should display OK.
If you continue to experience difficulties, then please let me know where on your web server you have uploaded your gallery to and I will let you know what your embedding code should look like.