In this case, the safest decision would probably be to attend the wedding ceremony, but not the reception. The second-best decision would be to take someone with them. But, the important point is they should include a source of support in their decision-making. It's time to move on to the next goal. So, with this third goal, a newly-recovering person will probably be willing to abide by the commitment to seek guidance from their sources of support, but it will be difficult to maintain that commitment when they're making the decision to NOT do something they really want to because doing that would put them at risk for relapse.
Every addict has the ability to relapse.
They do it all the time. On the other side of the spectrum, every addict knows how to abstain. With the fourth goal, addicts make a list of at least 20 high-risk and 20 low risk thoughts attitudes and behaviors. Then they check these lists out with some trusted source of support to make sure the list is accurate. If they don't, then they won't recover- they won't remain abstinent.