• Technical Conference:  04 – 09 May 2025
  • The CLEO Hub: 06 – 08 May 2025


Request CLEO Notifications

Get CLEO Conference and Exhibition information.


Early and Standard Registration Deadlines

Payment MUST be received with your registration form or online registration; NO registration will be processed without payment. All payments must be in US Dollars. Registrations received after 23:59 EDT (UTC-04:00) on Tuesday, 26 March, will be charged the Standard Rate. Registrations received after 23:59 EDT (UTC-04:00) on Tuesday, 09 April, will be charged the Late Rate. Upon receipt of your registration and payment, a confirmation letter will be e-mailed to each registrant. PAYMENT ISSUES WILL DELAY THE PROCESSING OF YOUR REGISTRATION. Note: All presenters must register by 23:59 EDT (UTC-04:00) on Friday, 26 April.

Code of Conduct

It is important to the success of this meeting that every attendee be treated with consideration and respect. Please review the Code of Conduct and Anti-Harassment policy.


Only credit card payments (VISA, Mastercard, American Express, Discover, Diners Club) are accepted during online registration.

Payments made by check or wire transfer must be made payable to Optica in US dollars and drawn on a US bank. Payments must accompany your registration form to process your registration order. 

Policies and Terms of Registration

Reasonable Event Policies and Terms have been established for CLEO. We encourage you to read these carefully, as all registrants to CLEO will be required to agree to these policies and terms as a condition of registration.

Privacy Policy

CLEO and its co-sponsors respect the privacy rights of our visitors and recognize the importance of protecting all information you may choose to share with us. To further this commitment, we have adopted this Privacy Policy to guide how we collect, store and use the information you provide.

Change and Cancellation Policy

Refund requests must be received in writing by Tuesday, 16 April 2024. A processing service charge of USD 75 is assessed. Registrations completed after Tuesday, 16 April 2024 are NON-REFUNDABLE. Please allow four to six weeks to process a refund request.

Your written request can be submitted by postal mail, email or fax.

c/o MCI USA | Dallas
6100 W Plano Pkwy #3500
Plano, Texas, 75093


Customer Support

+1 800.888.2843
+1 972.349.7840