In one word, Yes. I believe everyone should send save the date cards unless you’re getting married in the next 6 months.
Save the Date cards are becoming more commonplace, especially if you’re getting married at a busy time of year like Christmas or Summer Holidays; they are expected out of courtesy. The pre-invitation cards let guests know that they will be invited to your wedding.
Save the Date cards should include details of the date and venue your wedding is taking place. By sending these out at least 6 months in advance it means that the people you love and want to celebrate your wedding with will be able to arrange to attend. But they will still be able make other arrangements, such as booking their summer holidays, so they don’t clash. Your guests will also be able to book time off work as well as their travel and accommodation for the wedding in advance and even save money.
Some couples only send Save the Date cards to their daytime guests, others choose to send them to everyone on their guests list. Make sure you have finalised your guests list before sending them out; once save the date cards have been sent you MUST send a formal invite closer to the day! Be clear on the save the date who you are inviting so there is no confusion.