I don't see a post_id in the wp_em_events table. And I don't see anything that looks like event info in the posts table.
Also just a note: I upgraded to the new version via the standard WordPress upgrade system.
Database structure:
CREATE TABLE IF NOT EXISTS Md_em_events (
event_id bigint(20) unsigned NOT NULL AUTO_INCREMENT,
event_slug varchar(200) NOT NULL,
event_owner bigint(20) unsigned DEFAULT NULL,
event_status int(1) DEFAULT NULL,
event_name text,
event_start_time time DEFAULT NULL,
event_end_time time DEFAULT NULL,
event_start_date date DEFAULT NULL,
event_end_date date DEFAULT NULL,
post_content longtext,
event_rsvp tinyint(1) NOT NULL DEFAULT '0',
event_spaces int(5) DEFAULT NULL,
location_id bigint(20) unsigned DEFAULT NULL,
recurrence_id bigint(20) unsigned DEFAULT NULL,
event_category_id bigint(20) unsigned DEFAULT NULL,
event_attributes text,
event_date_created datetime DEFAULT NULL,
event_date_modified datetime DEFAULT NULL,
recurrence tinyint(1) NOT NULL DEFAULT '0',
recurrence_interval int(4) DEFAULT NULL,
recurrence_freq tinytext,
recurrence_byday tinytext,
recurrence_byweekno int(4) DEFAULT NULL,
blog_id bigint(20) unsigned DEFAULT NULL,
group_id bigint(20) unsigned DEFAULT NULL,
PRIMARY KEY (event_id),
KEY event_status (event_status),
KEY blog_id (blog_id),
KEY group_id (group_id)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=127 ;