The difference in the income level of the individuals will, needless to say, have a great bearing on the extent of the wedding celebrations. Weddings in Jakarta range from simple meals in the family home, to small receptions in community centers to grand extravagant affairs in the Jakarta Convention Center or 5-star hotel ballrooms.
At most wedding receptions, the guests arrive, sign the guest book, accept their thank you token, deposit their gift and enter the reception hall.
The path into the reception hall will be flanked left and right with members of the extended families, often dressed in similar traditional dress. A smile and nod to some of these people would be appropriate. Following the family members may be young men and women holding a chain of flowers. This is called the pagar ayu or 'fence of beauty'.
If you arrive on time you will be able to witness the procession of the wedding couple into the reception hall. Depending on the wealth, social standing or ethnic group, this procession can be quite impressive. The bride and groom may be proceeded by dancers who give a traditional dance performance before the wedding couple goes on stage. Or the performance may come after the bride and groom are seated. The parents of the bride and groom and other senior family members will follow the couple in procession into the room.
Then come the speeches! A representative of each family will address the crowd to thank them for their attendance and to give long, complex expressions of regret if any arrangements for the reception are lacking or found wanting. Depending on whether or not you have one or two representatives speak (thank goodness at some weddings there is only one person representing both families), the speeches can take up to half an hour.
After the speeches, the guests are invited to come to the stage and shake the hands of the bride and groom and their parents. Depending on the number of guests this receiving line can go on for hours. Traditional music may beplayed throughout the reception.
After going through the receiving line, the guests are invited to eat. The feast can be quite extensive and is a good opportunity to try cuisine from different regions. It could be as simple as nasi goreng or bakmi goreng, ikan asem-manis to the more elaborate where there will be food stalls with sushi, tempura, kambing guling, dim sum, beef Wellington and other western dishes. Once the speeches are complete, it is also acceptable to eat first and then join the receiving line after your meal if the line is quite long.
When should you arrive and how long should you stay?
While some attendees will arrive early, the timing of your arrival should be determined by whether or not you want to see the procession and hear the speeches. If you do want to, you should come on time. If you. d rather miss the grand entrance and speeches, you can come 30-60 minutes after the time noted on the invitation. Then you can enter immediately into the reception hall, shake hands and proceed to the buffet tables.
The length of time you spend at the reception is entirely up to you. Many Indonesians may only stay 15-30 minutes to eat a small snack after shaking hands, especially if they have another invitation to attend that night. Some people can even have up to 5 or 6 wedding invitations for one evening! If you are enjoying the splendor and the food, know lots of the attendees and enjoy the chance to chat, stick around and enjoy yourself. If, on the other hand, you don't know anyone who is there, it is acceptable to shake hands, eat and leave promptly (SMP-sudah makan pulang-when you've finished eating you can go home :). In a small wedding you will shake hands again before leaving.
Don't expect that alcohol will be served at the wedding reception or that there would be dancing, this is highly unlikely. Likewise, coming to a wedding after drinking would be considered very rude. Even if the groom is your drinking buddy, weddings are not an appropriate venue in which to be drunk.
Source : http://www.expat.or.id/info/weddings.html
