When a seizure occurs, your students are going to need information suitable for their age level and level of comprehension. Your students also need reassurance. We encourage you (or a school nurse) to explain what has happened to the class, answer their questions, and give them a chance to say how they feel about what occurred. Doing this can greatly reduce the social impact of the seizure.
The entire staff at my son's school participated in a one-hour session about his epilepsy at the beginning of each school year. This session was included in the school's staff development training during the 3 days prior to the students' first day of classes. Because my son's seizures caused him to wander in a trance-like state, every adult on the school property was included in this session about epilepsy. I was also granted time with each of the classes my son was in. The teacher arranged for my son to be in the school library while the teacher and I talked with his classmates about epilepsy and how it affected my son. The students asked questions and even made suggestions how they could help my son in the event he had a seizure at school. In the upper grades students who were aware of his epilepsy often asked his and the teachers' permission to develop science fair projects based on the brain and seizure disorders. My son was not only willing but also excited to contribute to these projects.