Why don't you speak with a friend? Perhaps one of yours may be willing to get a bit of culture and have some fun cooking a small feast for the two of you?
I had the best holiday experiences in the kitchen, laughing and preparing the food together. Imbolc is about enjoying yourself and taking the time to do things that you may be too busy to do otherwise. Sabbats are about merriment! Imbolc says "Spring is near!" And everyone enjoys warmer weather.
It is a good time for divination, so if you're friend doesn't mind, pull out some dice or playing cards, make rune cards if you don't have a set of staves, do tea leaf reading (always fun), use 3 coins for the I-Ching--the possibilities are endless!
Then later you can have your own personal ritual alone. Consider this day a vacation from the chores of life. Have fun with those around you, sit down with friends or family with your favorite movie and some popcorn. Live in the moment. The specialness in the day is in your control based off of your perspective. People feed off of emotion. With some a smile, some playfulness, and optimism, I'm sure you're parents will catch on. They may think you've gone crazy, but hey, it's your day to shine.
And Imbolc is celebrated February 1-2. So if you plan for something at such short notice, you have an extra day. Some celebrate the 1st, some celebrate the 2nd, and some celebrate both! Both days are meaningful in a variety of cultures. The Celts used to begin celebrating Imbolc tonight, on January 31st. Others celebrate the exact calculations between winter and spring solstices which is the 4th-5th.
Since you're cutting it short on time, I thought I would let you know, the date isn't as important as the celebration itself.