Based on the search results, there are several events that will happen on October 13, 2023. Here are some of them:

• The U.S. Embassy front entrance in Malaysia will be closed to all pedestrian traffic beginning at 12:00 PM until the completion of the demonstration.
• It is National No Bra Day, National Train Your Brain Day, National Yorkshire Pudding Day, and World Egg Day.
• Former Hamas leader Khaled Mashal urged Muslims worldwide to extend their support to Palestine on October 13, which triggered high alert security measures in some areas.
• The Passing of King Bhumibol will be remembered in Thailand.
• It is also a Friday the 13th, which is considered by some to be an ominous day due to superstitions and beliefs.

It is important to note that these events are subject to change and there may be other events that will happen on that day that are not included in the search results.