Blank screen when activated

Hello.
1) Its possible because of not enough memory at your server during activation of the plugin. I can suggest this trick. Please deactivate all active plugins, then try to activate the Booking Calendar and after that activate (one by one) all other your plugins.
2) If its not help please recheck your error.log file at the server configuration to be sure in a reason of this error. Probably you will be need to ask your server administrator or support of your hosting to increase the memory for the server execution in the php.in file.
Kind Regards.