NEW YORK--(BUSINESS WIRE)--Halper Sadeh LLC, an investor rights law firm, is investigating whether the sale of ON24, Inc. (NYSE: ONTF) to Cvent for $8.10 per share in cash is fair to ON24 shareholders. Halper Sadeh encourages ON24 shareholders to click here to learn more about their legal rights and options or contact Daniel Sadeh or Zachary Halper at (212) 763-0060 or sadeh@halpersadeh.com or zhalper@halpersadeh.com. The investigation concerns whether ON24 and its board of directors violated the federal ...