So, MAA asked Chiranjeevi, Nagarjuna, Venkatesh, Mahesh Babu and Prabhas to come events in USA. They completed one event with Chiranjeevi but that got Sivajiraja team to fight with Naresh team openly.
With some mis-coordination, they couldn't complete Mahesh event and it had to be canceled. Now, Prabhas agreed for an event and with him, Nagarjuna could also join, it seems.
As this will be new combination, an event with both of them will be a big crowd puller say the sources. After 10th March elections, whoever wins MAA presidency, they will take care of the event to happen during fall season, in USA, it seems.