Here is a link to a short video about traditional foods eaten on Rosh Hashanah with explaination. This is for the Jewish New Year which lands on a different date than the secular New Year due to being on the lunar calendar.
To make it easier to keep track of the Jewish holidays there are cell phone apps thst have the dates. Also you can google the holiday. Make sure to google the year along with the holiday when searching.
Watch "It's Rosh Hashanah- Happy Jewish New Year!"