This is a great thread! Here are some things you can do and purchase without a guest list/head count 1. Cake Topper 2. Bouquet Jewel, you could also make your bouquet 3. Dress 4. accessories like shoes, hair flower, jewelry, garter 5. Wedding bands 6. Grooms Attire 7. Toasting flutes 8. Cake cutter/server 9. Any kind of signage, like directional signage pointing to your wedding, mr. & mrs. or bride and groom chair signs 10. Start working on welcome books/letters and pre-travel brochures 11. Book photography 12. Order table decorations 13. Book entertainment 14. Think about wedding day hairstyle and make-up, collect pictures to take to your stylist 15. Book your travel accomodations and flights 16. Book your honeymoon 17. Start buying your clothes for your trip, welcome dinner attire, rehearsal dinner attire etc...