Thanks for all replies!
It went reasonably well. The extra guy Arno invited couldn't come after all neither could Tessa (for reasons I understand but won't mention for her privacy), so it was just Suzanne, Tim, Arno and me. Tim and I have not spoken about it, although I do believe that he wasn't too happy about Arno inviting the two extra people, since he's kind of an introvert and does prefer his outings to be with people he knows.
Apart from that, it went well! We went out to get a drink before the movie started and Arno explained the reasons why Tessa couldn't come, which really dictated the conversation a lot, but not in a bad way. After the movie ended we all went straight home since it was already past midnight.
Suzanne didn't make any comments so that went well.
For the same reasons that Tessa couldn't come to the movies, they also cancelled the New Years Eve party. Someone else did invite everyone to his home the day after, but seeing as I already had made other plans in the mean time as well as not knowing this third person all that well, I felt that I could graciously decline and wished them much fun.