Tim/Cassie: Earlier than Dick/Tim, at a table
It was incredibly strange to be at the wedding between his ex-girlfriend and a former enemy. Tim knew it would be weird, maybe even a little bittersweet, but actually being there definitely made it worse. Not so much that he really had a problem with anything, he was genuinely happy for Steph and she seemed so happy, but it wasn't an ideal situation. Still he swore to support her and he was a man of his word. Having Cassie there made things a lot easier. Especially since he had a fight with Dick on Bruce's post and he had no idea where to go from there. He didn't regret it, or anything that he said, but it never set well with him, being in conflict with his brother.
So he tried to put it out of his mind and got some food, trying not to make a face at the Riddler coloring of everything. Greeeeeat. He brought Cassie a drink and settled down there, away from the dance floor for now, while he gave himself time to process everything. And she was the only person he felt comfortable around these days. Tim managed to get a little sleep the night before, although he was slightly anxious about what was going on in Gotham while they were all here instead. But the police had to be good for something.
He was in a suit, he had one for special occasions, but it'd been awhile since he wore it. "Thanks for coming with me, Cassie. This would've been very awkward otherwise."