Skye and Tidas were surprised by the impromptu party, to say the least. Their Wedding Anniversary wasn't for a few months, but Lucas and Lidia wanted to celebrate with them while they had the chance..
Skye and Tidas couldn't really do much for their first year anniversary, and her parent's throwing them a small party was very sweet. She assumed that they were celebrating because Lucas and Lidia wouldn't be around when their true date came, which was partly right. Lucas had been in the Capital when Genie and Magnus had decided to send Skye and Tidas as Diplomats to Sai.
Magnus had requested both his, and Lord Reinbolt's presences to discuss sending troops north. When he'd reached the palace, one of the servants told him of their plan to send them to Sai. Lucas had snapped on Genie for it, and had nearly punched him.