Event.m

#import "Event.h"
#import "AFNetworking.h" // it does not depend of AFNetworking at the moment, so I'd delete it

@implementation Event

// change the id here to instancetype, read more here http://nshipster.com/instancetype/
- (id)init
{
    return [self initWithTitle:@"defaultTitle" detail:@"defaultDetail"]; // don't need to assign self
}

- (id)initWithTitle:(NSString *)title detail:(NSString *)detail
{
    self = [super init];
    if (!self) return nil;

    self.title = title;
    self.detail = detail;

    return self;
}

@end

events2.json

{
    "resultsDay1": [
        {
            "title": "Registration(1st day)",
            "detail": "Main Hallway"
        },
        {
            "title": "Pre-Conference",
            "detail": "3 sessions starting at 12:00PM"
        },
        {
            "title": "Opening Keynote",
            "detail": "Beautiful sun @5txc"
        }
    ],
    "resultsDay2": [
        {
            "title": "Registration(2nd day)",
            "detail": "Main Hallway"
        },
        {
            "title": "event TBD",
            "detail": "Silver room"
        },
        {
            "title": "event TBD 2",
            "detail": "Copper room"
        }
    ]
}

ScheduleTableViewController.h

#import <UIKit/UIKit.h>

@class Event; // use a forward class declaration instead of importing header. This speeds up compile times.

@interface ScheduleTableViewController : UITableViewController

@property (strong, nonatomic) Event *event; // what does this event mean? Rename or remove.

//@property (strong, nonatomic) NSArray *eventData; // data suffix makes me think it's an NSData that I have to unpack
@property (strong, nonatomic) NSArray *events; // I'd just call it events instead.

@end

ScheduleTableViewController.m

#import "ScheduleTableViewController.h"
#import "AFNetworking.h"

@implementation ScheduleTableViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    NSURL *url = [[NSURL alloc] initWithString:@"http://backbone7.sdbapps.com/events2.json"];
    NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
    
    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    operation.responseSerializer = [AFJSONResponseSerializer serializer];
    
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        
        NSMutableArray *events = [NSMutableArray array];
        
        for (NSString *key in responseObject)
            for (NSArray *eventsForOneDay in responseObject[key])
                [events addObjectsFromArray:[self parseEventsForOneDay:eventsForOneDay]];

        self.events = [NSArray arrayWithArray:events];
       
        NSLog(@"The final JSON array is: %@", self.events);
        
        [self.tableView reloadData];
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error Retrieving Events!"
                                                           message:[error localizedDescription]
                                                          delegate:nil
                                                 cancelButtonTitle:@"Ok"
                                                 otherButtonTitles:nil];
        [alertView show];
    }];
    
    [operation start];
    

}

#pragma mark - Table view data source

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
    
    //Event *event = self.eventData[indexPath.row]; // again, makes me think of NSData
    Event *event = self.events[indexPath.row];
    
    cell.textLabel.text = event.title;
    cell.detailTextLabel.text = event.detail;
    
    return cell;
}

#pragma mark - Private

- (NSArray *)parseEventsForOneDay:(NSArray *)dayEvents
{
    NSMutableArray *events = [NSMutableArray array];
    
    for (NSDictionary *eventDict in dayEvents) {
        Event *event = [[Event alloc] initWithTitle:eventDict[@"title"] detail:eventDict[@"detail"]];
        [events addObject:event];
    }

    return [NSArray arrayWithArray:events];
}