You may request a visa support letter from the ACM via the following link. It works for (1) authors and speakers with accepted papers/posters/talks, (2) conference committee members, and (3) registered attendees.
If you require a visa support letter, please fill in the form at https://supportletters.acm.org.
Please be aware that ACM does not issue formal letters of invitation for any ACM-sponsored conferences.
Please give 10 business days to ACM for sending your visa support letter.
If you encounter any difficulties with the visa application process or have other concerns, please don't hesitate to contact us.
We wish you the best of luck with your travel arrangements!