The first video comes from The Economist, and it explains the history and relevance of St. Patrick's Day as a celebration of the brand "Ireland" and "Guinness", Ireland's main export to the world. The video is only 2':22" long, the pace of the narrator's voice is not fast, and there are good subtitles, so it is suitable for B1 students and above.
For a more institutional version of the "Ireland" brand, you can watch this serious 2021 video produced by the Irish Foreign Ministry, which lasts 3':06", and has subtitles, but whose language and background music, make it more suitable for B2 students and above.
SmarterTravel shows a tourist view of St. Patrick's Day celebration in the streets and pubs of Dublin back in 2018, in this 1':13" video with big, simple text and no voice, which is also suitable for B1 students.
C1 students and above can visit the webpage of the Irish Times and do a general knowledge test about Irishology.
And finally, to rejoice your heart, you can tap your foot to the catchy rhythm of an Irish song and enjoy this cute video by Jess Glynn, published in 2014, which can be recommended for B1 students and even for lower levels. Happy Paddy's Day!