A convocation is a calling together of people — or it can also refer to the group that has gathered in response to the convocation. A convocation of students might protest a new dress code policy.
The noun convocation stems from the Latin word convocare, meaning "to call together," which combines the prefix com-, meaning "together," and vocare, meaning "to call." A convocation — or calling together — of citizens to unite in protest may bring an end to a country's unjust government. A convocation — or assembly — of workers might gather to demand higher wages and better working conditions.