There was a recent news curated from #CNA (Channel News Asia) that a anti-military rally/protest by an opposition party held near MBK, a prominent shopping area of tourists. See article here: https://www.channelnewsasia.com/news/asia/thailand-anti-military-rally-opposition-thanathorn-12184272
After seeking a clearer understanding from our local colleagues, we understand that this rally/protest was only an hour long.
We at DeFreesia, do not take political stands but will however advise tourists visiting Bangkok, Thailand to stay vigilant to avoid vacation disappointments due to traffic.
If you need any assistance for your travel in Thailand, feel free to contact us. DeFreesia Transport Services – an authorised operator by the Tourism Authority of Thailand (License No. 14-02461)