I always help ASAP :) I don't like those slideshows so there is no such feature in Event Gallery.
If you want to add it yourself forget about this with Event Gallery 3.2.x. It makes no sense to add this there. Event Gallery 3.3 uses colorbox as lightbox implementation. It supports slideshows but I don't use this part of the code. What you can do is to enable the debug mode in the components options. This will load all the js/css files uncompressed and you're free to add this feature yourself. Your support question indicates that can do this yourself.