We are planning our wedding for next winter and have been recommended by a friend that I should set up a wedding website where people can RSVP online instead of having to send back RSVP cards, you can also add details like parking, menus, accommodation codes..
I think you just put on the invite 'please RSVP at blablabla.com by X date'
I know you lovely vipers can be fairly opinionated on wedding etiquette (grabby poems, MIL in white..etc) 
so would like your thoughts on this! I'm not sure it's necessary but happy to be told otherwise.