Melania, wife of US President Donald Trump, is scheduled to visit the school on Monday to watch "happiness classes" and interact with the students.
The sources in Delhi government said the US embassy communicated to the city administration on Saturday morning that names of Kejriwal and Sisodia do not figure in the list of invitees for the event.
According to the original schedule, Kejriwal and Sisodia were to welcome Melania at the school and brief her about rationale behind introduction of happiness classes as well as Delhi government's overall reform initiatives in the education sector.
Expressing anguish over exclusion of names of the two leaders from the event, Aam Aadmi Party spokesperson Saurabh Bharadwaj said it has been a "protocol" and "convention" that state leaders are present when any foreign leader attends events in their states.
He also alleged that the names of Kejriwal and Sisodia have been dropped from the guest list at the behest of the BJP-led central government.
When asked about the issue of Kejriwal not being part of the guest list for Melania's visit to the Delhi school, BJP spokesperson Sambit Patra said that there shouldn't be any "low-level politics or petty politics" on issues which are of national interest.
The Delhi government introduced the happiness curriculum in July, 2018.
As per the curriculum, students studying in classes I-VIII at Delhi government schools spend 45 minutes every day to attend "happiness classes" where they participate in activities like storytelling, meditation and question and answer sessions.
Similarly, for nursery and kindergarten students, the classes are held twice a week.
The Arvind Kejriwal-led government has been spending a large chunk of its budget on education in the city.
Business Standard has always strived hard to provide up-to-date information and commentary on developments that are of interest to you and have wider political and economic implications for the country and the world. Your encouragement and constant feedback on how to improve our offering have only made our resolve and commitment to these ideals stronger. Even during these difficult times arising out of Covid-19, we continue to remain committed to keeping you informed and updated with credible news, authoritative views and incisive commentary on topical issues of relevance.
We, however, have a request.
As we battle the economic impact of the pandemic, we need your support even more, so that we can continue to offer you more quality content. Our subscription model has seen an encouraging response from many of you, who have subscribed to our online content. More subscription to our online content can only help us achieve the goals of offering you even better and more relevant content. We believe in free, fair and credible journalism. Your support through more subscriptions can help us practise the journalism to which we are committed.
Support quality journalism and subscribe to Business Standard.