Congratulations or "Happy New Year". There is an occasion to toast or celebrate. The symbol is often found on invitations for birthdays, New Year's Eve or weddings.
The clinking glasses emoji was introduced in 2016 and released as part of the Unicode 11.0 standard. This emoji can be found under the food and drink
category. Because the clinking glasses emoji has been around for quite some time, it should display correctly in the majority of operating systems.