The short answer is yes, but in general you shouldn't need to.
If you wish to communicate to the event organizer you must always CC firstname.lastname@example.org on any and all communications. This is so our team can stay in the loop on any event changes, fees, issues, etc. We do not recommend reaching out to any of the guests directly as they may not wish to receive any direct correspondence and everything should go through the event organizer.
If you are every unsure, please reach out to email@example.com and we are more than happy to communicate to organizers and guests on your behalf.
Please remember that you are not allowed to send any marketing emails, promotions or links that are not part of Offsyte to any organizers or guests. Doing so will result in the termination of your contract with Offsyte.