Great response to the question..."What are appropriate reasons for missing church?" on gotquestions.org
It is a helpful discussion for both regular, irregular, and seldom-ever churchgoers. This is a touchy subject for many (becuase of inner conviction?), but is well handled in a way that points to Biblical answers.
Other relevant and helpful responses to questions:
Hebrews 10:24-25
"24And let us consider how we may spur one another on toward love and good deeds. 25Let us not give up meeting together, as some are in the habit of doing, but let us encourage one another—and all the more as you see the Day approaching."
