Band API provides a json api with a symfony easyadmin. Simply add your bands, festival and stages and retrive these information via the rest api.
/api/festivals
/api/festivals/{festival}/bands
/api/festivals/{festival}/{bandSlug}
/api/festivals/{festival}/stages
/api/festivals/{festival}/stages/{stageName}
/api/festivals/{festival}/stages/{stageName}/timeslots
$ composer install
$ docker-compse up
$ php bin/console doctrine:migrations:migrate
$ symfony server:start