[quebecois]

I'm planning on attending an orthodox service....and I need to know what to expect and what to avoid. Any advice would be appreciated.

[drew]

Well, there's really nothing to avoid, but prepare yourself for a lengthy service, with lots of standing. Depending upon the type of service (Russian, Greek, Serbian, etc.) there will be some ritual that will seem incomprehensible, as will some of the language. Dress nice, Orthodox Christians dress up for church, especially on Christmas. Also, I know it sounds weird, but a lot of incense is used and I know that some people find the smell of incense stifling. Since the service is long (2 hours) and the church will be packed, if you have an aversion to incense or have any claustrophobia issues, I suggest you take a break and get some air. Sit (likely stand) at the back of the church if you feel you may need to duck out. Liturgical books are always supplied at Orthodox churches, so you can follow along with the service. The service is beautiful, with a choir singing responses to the clergy, and no musical instruments are used. It really gives you a sense of mystery and otherworldliness. A lot of the action takes place behind closed doors, where the altar is located (unlike in Catholic churches where it is out in the open). This is due to Orthodox belief that lay people are not priveleged to see the great mysteries of God, especially the turning of the communion wine and bread into the flesh and blood of Christ. At the end of the service, the congregation goes to the front of the church to kiss an icon of Christ and the patron saint of the church, and a cross that the priest holds. If you'd rather not participate, just go out the back. If you want to, just do what the others do. Also, the congregation usually gathers at the priest's house after the service. If you feel comfortable enough, by all means go. You'll be more than welcome and it would be a good opportunity to familiarize yourself with the faith. Priests are a wealth of information about church history and Christianity in general. Hope this helps, and I hope you find the service interesting and fulfilling.

[FormerLib]

Here is the definitive article on what to expect at an Orthodox service.

[Liz]

Not knowing the exact nature of the service you plan to attend, I would say that generally the services are lengthy and congregants usually stand for long periods to watch the very ornate and music-filled processions and ceremonies.

[visualops]

In addition to what drew posted, I'll add that depending on the church, you should have your arms (long sleeves but can be 'sheer') and head covered (scarf or similar), and women should not wear slacks. At least that was my experience.
drew is right, ceremonies are long, but interesting.
The Greek churches I was in, usually the priest has a helper or some senior person who helps direct people. I think you'll find folks very helpful when they see you are unfamiliar with the routine.
Are you going to an old calendar church in Montreal? I'm making a guess because of your nickname.