I can give you several sentences.
The nouns in the sentence, people and hall, are both concrete nouns. There are no abstract nouns in the sentence. The use of the word 'protest' is the trick. As a noun, protest is an abstract noun, but in your sentence it is the verb form 'to protest', not a noun.
The protest lasted several hours.He began to protest his mother's orders.I will protest against inequality.
It seems that you protest too strongly.
The leader of the protest told everyone that their demands had been met, pacifying the protesters.
Here is a sentence using the word riot. The crowd was angry at the decision made by the court so they created a riot in protest.
Sydni opened her mouth to protest, but her mom silenced her with a look.
There is no universally agreed definition as to which sorts of humorous protest count as tactical frivolity.
The vociferations of the crowd could be heard during the protest.
Protest
The women supported each other in a boycott to protest the high prices at the market.
A homograph for the word "protest" is "protest," pronounced differently.
Fulminations is a word used to describe a protest that is being expressed. A good sentence would be, the fulminations of the workers were not being heard.