Ah, well, enhance gathering of friends feelings, better communication, one another's life, and their respective situation, etc. I think whether attend party according to the circumstance of oneself and decide. If people are ordinary student, have joined the work... What I say is no obvious gap, make oneself feel embarrassed, I feel stiff, or go to a relatively good drops. But, oh, if between classmates got obvious gap, or ordinary contacts is less, not to the necessary, life will change a lot, "many things need to be quickly forget about and never turn back, busyness steps is difficult to cease, we are all the time and dreams of slaves, then, are all responsibilities and insist..." Ha ha, then you will have to find something reason ah, such as "ah, I today to work overtime, now I work very tight" or "embarrassed, I catch a cold (or other legitimate ailment) very serious" or "embarrassed, a few days ago I went to relatives, estimate can't go to the" or "advance and small partners about good, you pretend to go to a party at first, then let him call you, say for you occupy, that pretty good also"...... That your choice