Does anyone’s church happen to have a feast day in commemoration of Saint Valentine? The holiday is coming up, but churchs in my area are silent on any liturgies offered for him
You’d have to find a traditional Catholic church, such as FSSP. They follow the 1962 Calendar of St. Pope John XXIII, which has St. Valentine of Rome on Feb 14.
The current OF Calendar for USA, which is the one most Catholic churches in USA use, has the feast (Memorial) of Sts. Cyril and Methodius on that day, and St. Valentine was removed from the calendar.
Where I live, England & Wales, S Valentine cannot be commemorated as 14th February is the feast of Ss Cyril and Methodius, and the day here is a feast (the middle rank of holy day). The Holy See made Ss Cyril and Methodius one of a number of patrons of Europe and all European countries have to observe that feast.
In the Extraordinary Form the 14th February is a fourth class feria and S Valentine is to be commemorated at Lauds and Low Mass. So you would have to go to an EF Low Mass here to have mention of S Valentine.