To block certain seats, you can create one "special" ticket type and set the date for ticket selling availability for that ticket type some time in the past. Next, associate this ticket type to the seats you want to block. This will result in seats being displayed but won't be clickable and therefore customers won't be able to purchase these.
Please note that in order to do this, you must have the latest Tickera and Seating Charts installed and if you are using Tickera with WooCommerce make sure Bridge For WooCommerce is latest version available.
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