This is stated in the notice of the US Embassy. “On October 28, political rallies and sit-ins are planned in Dhaka and other cities across Bangladesh, the largest of which are planned to be held near the Baitul Mukarram National Mosque and on VIP Road near the Central Police Hospital. American citizens should remain vigilant and remember that demonstrations intended to be peaceful can devolve into confrontation and turn into violence. You should avoid demonstrations and exercise caution around any large gatherings.”
The UK Foreign Office website also issued travel advice to its citizens, referring to political rallies taking place on October 28 in Bangladesh, asking them to avoid large gatherings, including demonstrations and rallies.