FishFright
More wheels than sense
It's common, we often print them. Traditionally invites are only a month or two before an event but as people tend to need longer to organise child care, travel, work, even flights, then a save the date card comes in. Once the venue and times are arranged closer to the time the invites are sent.
In answer to the op, no response needed. An rsvp will most likely come with the invite.
You are Moonpig AICMFP