user: Question: Which event is in round 1 with a record at 5-1?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Loss', '21-4', 'Rin Nakai', 'Decision (majority)', 'Pancrase 252: 20th Anniversary', 3.0, '5:00', 'Yokohama , Kanagawa Prefecture , Japan']
SQL:

assistant: SELECT "Event" FROM "Table" WHERE "Round" = 1.0 AND "Record" = '5-1';