My confirmation bias would say that supports my guess on Halifax Music Fest night two being Mumford and Sons/Caamp.
Since they could accomodate both festivals. Play Halifax >> Head to Europe >> come back from europe to play Newfoundland. From a travel perspective it makes sense. They currently have nothing from July 10-30th. The Barr Brothers are also opening for them for part of their tour so theres a connection there with night 1.
On another note. Red Jumpsuit apparatus is coming to Moncton and Halifax Aug 26/27th. Scream/Emo is certainly on a big comeback right now.
Very nice lineup! Although im surprised with Weezer being there as they have no tour at all until September, so they must had asked a good price to get them here. Or they have a Summer tour that has not yet been announced or they're the band that will play Churchill Park as well the month after.
With The Chicks already on Tier3 pricing, this edition has all the tool to be a success and push Sonic to make it yearly event. Both nights should have no trouble of getting the 20k mark.
And looking at the prices of that Fall tour, its probably the only shot for the East Coast to get them here. They're playing Place Bell (10k) in October and tickets are 193$(!!) and up for LowerBowl sections.
Promotions going on for The Jonas Bros show at Moncton stadium (Buy One Get one Free)
I checked Ticketmaster, and while most of the cheap tickets are gone, they're having trouble with the more expansive one that goes from 150$ to 545$ at the very first row on the floor.
On a more positive note, the Cavendish Beach Music Festival happened last weekend with over 50k total for the 3 days. Whats impressive is 80% of those are from out of province!