walking by a Lutheran church: no 9:30 service

I finally stepped inside a Lutheran church I walk by now and then. I wanted to finally accept the invitation (two emails so far) of one of the pastors in the church whom I had met weeks ago (http://project05952381.blogspot.com/2010/08/walking-by-lutheran-church.html). I thought their service was going to be at their usual 9:30am, but today it was scheduled at 10:30am. I opted to excuse myself and left since I had no intention to miss worship at FAPC. As I've mentioned several times, I've got no intention of quitting FAPC, which has become my spiritual home on this earth. My interest in the Lutheran Church is mere curiosity in the differences in practices and doctrines between PC(USA) (http://www.pcusa.org/) and WELS (http://www.wels.net/), which this Lutheran church is associated to.