Invite All Friends To A Facebook Event in one click

1. Go to your Event Facebook page and click on Invite friends.
2. Scroll down your friend list until the end to ensure you have loaded all the friends you want to invite.
3. On Chrome, press CTRL + SHIFT + J (Windows) or CMD + Opt + J (Mac).
4.  Copy and paste this javascript:elms=document.getElementsByName("checkableitems[]");for (i=0;i<elms.length;i++){if (elms[i].type="checkbox" )elms[i].click()} followed by an Enter in the console space. You will then see all your friends name automatically ticked.