When this amenisty will be open on 2020

First of all, 

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Concerning your inquiry about UAE immigration amnesty, which clearly covers Abu Dhabi and Dubai, is available to persons overstaying their visa

The UAE amnesty has come in to action on 1 August 2018 and has ended in 31 October 2018 giving a three months grace period to finalize trespassers their amnesty
 But as per now, there is no official announcement yet but just rumors that another amnesty is coming for illegal residents .in UAE