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Using a throwaway because some of my friends are on Reddit.

I (23F) have known this guy (23M), let's call him A, for 6 years. We were part of a large university group that dwindled to four, but I've never spent time one-on-one with him. We only meet in group settings, so I don't really know him well.

We've both been working in the same city for a year, yet we've only met up twice: once for a drink and another time when a mutual friend (C) visited me. A has a complicated schedule, so I offered to hang out when he's free, but he never took me up on my offer (to be fair, I never insisted either because I'm scared hanging out one-on-one would be awkward since we don't know each other that well).

We have two mutual friends: B (his best friend, with whom I've barely spoken since uni) and C, with whom I am very close.

A is getting married in July. I said yes to his invite in February, but upon checking details, there is no accommodation for guests. The venue is a remote place in the middle of nowhere, where hotels are rare. I'd need someone to drive me from the train station to the venue, back to the hotel, then to the venue for brunch the next day, and finally back to the station. Train tickets are extremely expensive, and the location is on the other side of the country.

Logistically, it's a nightmare. I'm stressed about finding a driver (Neither C nor I have a driver's license) and the costs are high (I also need to buy a dress for the occasion). If this were a close friend's wedding, I'd go in a heartbeat. But I'm realizing I don't know A well, and we haven't made an effort to see each other since uni. I'm questioning if all this trouble is "worth it."

If I say no, am I being selfish? Will I ruin my friendship with B or C? I feel guilty and selfish for weighing the cost/benefit of something that is supposed to be one of his important moments, but I also know I wouldn't be comfortable going. Looking for an objective opinion.