In April 2017, the Connecticut Department of Public Health (DPH) investigated reports of gastrointestinal illnesses among attendees at 3 events at a hotel and adjoin convention center held in a one week period. Among approximately 900 total attendees, 200 cases were identified in 65/179, 36/86 and 99/212 responding event attendees, respectively. No Event 1 food or beverage items were associated with illness; however 3 items from Event 2 and 5 items from Event 3 were. All 3 events occupied an inadequately cleaned area where an Event 1 attendee vomited. Eight of 9 case-patient stool specimens tested norovirus-positive, genotype GI.P7-GI.7. Seven of 29 food workers stool specimens tested positive for the same strain. Six employees reported working while ill.