Which historical incident led Mahatma Gandhi to call off the nationwide Rowlatt Satyagraha?

After which incident the Non-Cooperation movement was withdrawn by Mahatma Gandhi?

Where was the session of the Congress held in September 1920 in which Mahatma Gandhi convinced other leaders about starting the Non-Cooperation Movement?

The title given by the British Government to Mahatma Gandhi which he surrendered during the Non-Cooperation Movement was:

The first mass movement started by Mahatma Gandhi was

Why did Mahatma Gandhi support the Khilafat Movement?