<human>: Can you give me the gist of the text in a nutshell?

So it's our 3rd year anniversary on the 25th (tomorrow), but he's visiting only tonight (he goes to a different college than I do), and will be leaving early in the morning tomorrow.

In my defense for not properly planning for this big date:
He asked me to be his girlfriend at our high school senior prom, but for the past two years we've been celebrating it on May 25 since we thought that was the date of our prom. Turns out, while reminiscing with one of our close friends about prom night earlier this week, our senior prom was actually April 25... 

*That being said,* I've had no time to really put together a touching, unique, original surprise/gift/anything for him because of time constraint... We usually do creative stuff like scavenger hunt leading to numerous gifts and a romantic dinner/movie night, etc., but I'm currently in class and I have work until 9pm tonight so I'm not sure what I should do? Should I buy something? Is there anything I can get/purchase that could still create a memorable night for us?
<bot>: realized we've been celebrating our anniversary on wrong date, need to whip up something meaningful to celebrate our actual anniversary for tonight only, need ideas!