Attending wedding

I went to attended a wedding with my mom today.The bride and bridegroom's parents sent two buses to pick us and other guests up at 11 o'clock and then provided us with a possibility to stay at the wedding hotel.The wedding started at 12 o'clock and we had already been sitting at that time. It was really beautiful and romantic there. Firstly, the bride’s father led his daughter down the aisle. The bride was very beautiful. The bridegroom was walking in front of them. Then the bride's father connected the bridegroom's and bride's hands and it was a moving scene. After the couple exchanged their rings and finished the ceremony program, we had a dinner.

Really well written! You seem to have had a wonderful time there! :-)

Attending a wedding

I went to attend a wedding today (you can either say "I attended a wedding today" or "I went to a wedding today") with my mom. The bride and bridegroom's ("bridegroom" is correct, but it is rarely used) parents sent two buses to pick us and other guests up at 11 o'clock, then sent us to the wedding hotel where the wedding was (or "where the wedding was being held"). The wedding started at 12 o'clock, and we had already sat down at that time. It's was really beautiful and romantic there. First, the bride’s father led his daughter walked out; (or, "walked his daughter down the aisle." This is what we would normally say.) she was a very beautiful bride., and The bridegroom walked in front of them, then, while the bride's father was hand his daughter to the bridegroom,. It was a moving scene. After the couple exchanged the ring and finished some the ceremony, we can started to have dinner.

Looks good! Remember to keep your tense consistent. If you're talking about something that happened in the past (like this wedding), make sure to always use past tense. I made a lot of corrections, but I had no problem understanding what you wrote.