How did you post your seating chart?

On a sign propped with an easel is the most common

We did assigned tables but not assigned seats. Everyone had their own place card that was set up alphabetically on a table by the entrance to the reception hall and their table number was written below their name.

A large professionally printed page posted on a large vintage mirror, which tested on a decorative easel

I went to one wedding where all the tables had little name tents and people just went and found their name. Alleviates the need for a sign that causes a hold up.

pinterest has a lot of ideas for this, but basically you need a sign, or you need to create escort cards. A sign works if you aren't assigning seats and have a buffet style dinner. Escort cards if you have plated and the servers will need to know if your guests are eating chicken, fish, beef etc.

We didn't do a printed seating chart, thank goodness too because we had more than two dozen last minute RSVP cancellations in the two weeks before the wedding and had to change the seating plan until the last minute. We handwrote seating cards and put on a table at the entrance, hung from a custom pegboard in alphabetical order.

(We went somewhat fancy with these, writing them on luggage tags to fit with out travel-themed wedding. The luggage tags doubled as wedding favours. But you can get basic plain escort cards at the dollar store for really cheap too.)