St. Patrick's Day can be a great opportunity for small businesses to attract new customers and boost sales. Here are some promotion ideas that can work well for small businesses:

1. Social media contest: Run a St. Patrick's Day-themed social media contest where customers can enter to win a prize by sharing a photo, video, or story related to the holiday. Make sure to use relevant hashtags like #StPatricksDay and #Contest to help promote the contest.
2. Green-themed discount: Offer a discount or special promotion on St. Patrick's Day that is tied to the color green. For example, you could offer a 17% discount (in honor of March 17th) on any green-colored products or services you offer.
3. Irish-inspired products: Create special Irish-inspired products or services for St. Patrick's Day. For example, a bakery could create special green-colored cupcakes or a coffee shop could offer Irish-themed drinks like a "Shamrock Latte".
4. Free St. Patrick's Day-themed item: Offer a free St. Patrick's Day-themed item like a sticker or pin with any purchase made on the holiday. This is a great way to incentivize customers to visit your store or website.
5. Charity promotion: Partner with a local charity and donate a portion of your sales on St. Patrick's Day to the charity. This is a great way to give back to the community while also promoting your business.
6. St. Patrick's Day event: Host a St. Patrick's Day event like a parade, live music, or Irish dancing. This can be a great way to attract new customers and create a festive atmosphere for your business.

Remember to promote your St. Patrick's Day promotion through your website, social media, and email marketing, and to keep your promotion relevant to your target audience and your business.

With a little creativity, you can create a memorable St. Patrick's Day promotion that helps you stand out and attract new customers to your small business.