Frustrated by Plug-In Installation

[Connie]

did you check whether the correct permissions are set for the folder of these 2 plugins?

I once got trapped when I uploaded a plugin and didn't notice that I uploaded a folder containing the plugin-file plus the plugin-folder

if you mean gsgallery-simple-image-gallery, check that these files

squareit-gallery.php
squareit-loadtab.php

and the 2 directories

squareit-gallery
squareit-loadtab

as well exist in the directory /plugins

concerning the event-plugin: I am not sure if that plugin even works correctly
see here: http://get-simple.info/forum/topic/932/events-plugin/

at least there you find information how to use it