In a era of data mining, data intelligence this is a small request! So, without waiting for anyone, let me make one with one entry at a time.
Date Why is this Hartal? Who Initiated it?
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8-01-2012 Mullaperiyar Samrakshna Samiti Mullaperiyar Dam Row [
2 28-02-2012 Trade unions in India Protest against the ‘neo-liberal economic & labour policies’ pursued by the Central Government
3 05-05-2012 UDF Protest Against Murder of T. P. Chandrasekharan
4 24-05-2012 LDF & BJP Petrol Price Hike
5 02-08-2012 CPI(M) Protest Against the arrest of CPM Kannur district secretary P Jayarajan
6 15-09-2012 LDF & BJP Petrol Price Hike
Got tired copying this list from Wikipedia. I think, this is not a productive way to list things.
A good list of hartal prepared by Mani karthik https://manikarthik.com/complete-list-of-hartals-in-kerala-from-jan-july-2008/
HARTAL BILLBOARD
Probably, each town or city should have a special electronic billboard to help public during hartal. For instance, it should show places where people can buy lunch or even donate lunch packs. What if households in a certain area come together to make food packets for people who are strangled?
Also, a hartal helpline for people who require conveyance and struck at home.