I recently had a conversation with a friend who happens to be a Reformed Pastor on the subject of saints days. He was uncomfortable with saints days and asked, "Is the church just allowed to invent any day to celebrate something?" And "Why celebrate the saints?"
The church should always be pointing us to Christ. Worshiping on a saint's day provides an extra opportunity to point us to Christ and to give us God's good gifts in Word and Sacrament. In some churches the day may be used just to tell us how nifty the particular saint was and how we need to live like him. This would be an improper use of the saint's day. Saints days should be used to show how these saints tell us something about Jesus. They are subject to abuse but so is everything in the Christian church. There are plenty of Easter, Christmas, and just regular Sunday services that are not centered upon Christ out there. If we got rid of everything that has been abused in the church we would have nothing left. The Scriptures have been abused more than anything else, should we get rid of them too?
My friends was also concerned that if the church decides to celebrate a saint's day then everyone in the church is required to come. He along with other Reformed folks believes that if the elders call you to worship you are being disobedient to them by not attending the worship service. This is based on a rather poor understanding of Hebrews 13:17 which gives the general command to obey those who rule over us. Aside from the dangers of basing a particular doctrine off of a disputed book such as the book of Hebrews, there are other passages that deal more directly with the issue of celebrating "special" days.
Romans 14:5-6a One person esteems one day above another; another esteems every day alike. Let each be fully convinced in his own mind. He who observes the day, observes it to the Lord; and he who does not observe the day, to the Lord he does not observe it.
The Scriptures speak clearly of freedom in regards to these days. We cannot require others to worship on these days and we cannot forbid others from worshiping on these days.
What stands behind this desire to create these rules and regulations about worship is the false notion that worship is primarily a duty that we perform. If worship is some duty that we do for God then we better make sure we get it right and that the right people show up. There's even something wrong with the phrase "Worship Service." "Worship Service" puts all the emphasis on us and our works. It is a "Divine Service" in which God serves us with His good gifts. God does not need anything from us. We need everything from Him. If saints days and feast days are viewed as another opportunity to receive wonderful things from God then I think there are plenty of good reasons to attend. True worship is receiving God's good gifts by faith. Deep down we know that we are pretty crappy worshipers. Our minds wander and our voices suck. If it were all up to our worship we would be on the highway to hell. We might as well go camping instead so at least we can ignore how lousy we are at worshiping God. If we go to the worship service the best we could hope for is that God grades on a curve and we can think in our minds about how much better we are than that guy who didn't show up.