If you depend on iCloud emails, you can set the vacation response right from your iCloud Email Settings. Log in to www.icloud.com and select the Mail. Once you open the mail app on the browser, click on the Settings icon from the left bottom of the sidebar.
Use your auto-reply to promote your expertise—you're going to a well-known industry conference, after all. You multitask and use your out of office to connect with colleagues/clients who are also attending the conference or event.

I used to work with someone who had a message telling people she only checked her email twice a day. You pretty much needed to call her if you needed anything outside of those times. (She worked in a remote office.) I think she had read one of those books on efficiency that recommended scheduled email time. But there were problems with this: 4. My department often had to email attachments or text to illustrate our questions/concerns. And we were on deadlines. Reading a page of text over the phone was not an efficient use of anyone’s time 5. She did outreach & was often out of the office on site visits, trainings, or travel to these places, but never ever set her OOO for these, because she was “working.” However, she was effectively not available to read emails from other staff until after hours on those days.
I’ve got you covered. I’ve compiled some of the best voicemail greetings you can use for virtually any situation you’ll come across.