After doing well at science fair, I started working with an extremely nice professor at the local university who encouraged me to submit my work to the relevant conference. I was rejected at large, but accepted to one of the workshops. The workshop is the day before the conference. The professor reviewed my paper twice, probably taking him a half hour or hour total (it's a short paper). He also told the conference he would shepherd me, which kind of puts his name on all of this. However, looking at the calendar to plan my flight etc, I noticed the workshop is on the day of Yom Kippur! I am not that religious, and if this was some huge event for me I could possibly make an exception, but I'm not sure if presenting my mediocre work (the work is good for a high school student, but really lame for an actual conference) to the few people who will come to the presentation supersedes such a holiday. Also, after being rejected I didn't really want to go anyway, since I won't understand most of the presentations and I feel they only accepted me to the workshop to encourage me since I'm a student.
How do I talk with the professor and the conference/workshop about my problem? It is completely my fault!
Side note: who schedules an academic event on Yom Kippur? That's like scheduling it on Christmas or Easter!
Follow-up: I decided to go. I'm just not sure what it's like submitting to a workshop of a conference but not the conference at large.