Your event management plan should cover: Event goals and objectives. Individual roles and responsibilities. Volunteers and volunteer training. Budget. Date and time of the event. Event master plan. Event location. Event management software.
You can search for such institutes in your area, and these can be pursued alongside a Bachelors degree in a subject of her choice! For internships you can use Internshala and Indeed or search for the top event management companies in your area, visit their websites, look for openings, contact them!