Another well received way is to print a mini calendar page with a 3-hole punch so your friends can attach it to their own calendars. Of course, you would have to circle or decorate the day that belongs to you.
The moment you have your date and location decided on, it is time to send out your save-the-date cards. It is fine if you have not closed up on the exact location, just letting them know the state and city your wedding will be held is sufficient.
You should send save-the-date cards to all of your intended guests when either of these circumstances fit your situation. Even friends and family members who you already know will attend should be sent a card.
There are really so many ways that you could play with to create your very own save-the-date cards for weddings. Have fun with them, and create a meaningful save-the-date that your guests can retain for keepsake.
If you know what your theme or colors are going to be, you can incorporate that into your save the date cards as well. You can also include your engagement picture if you have one. You can have these cards made at a bridal shop or stationery store. You might be able to get a discount if you order the save the date cards when you order your wedding invitations.