Green part is what Elizabeth san posted, the rest is one of the possible translations by myself.
Recently, I travelled to Tokyo to see the Eisa festival in Shinjuku.
最近 東京に旅行しました。新宿区のエイサー祭りを見に行きました。
Eisa originated in Okinawa (as part of the O-Bon Festival (But I couldn't figure out how to put this in :\)),
エイサーはおきなわでお盆の祭りの一環として始まりました。
which celebrates ancestral spirits in the Buddhist religion.
お盆は仏教で祖先の霊を祀る行事です。
Eisa is now regularly performed throughout the year.
今では、エイサーは年間を通じて、行われます。
It is a festival of music and dance that is performed by groups of adults and children.
お祭りの間、大人と子供は集団で踊ったり、歌ったりします。
Some performers play drums ranging from the small handheld 'Paranku' to the large 'Odaiko'.
太鼓を敲く人もいますが、太鼓は小さい「パランク」から大きい「大太鼓」まで(いろいろな大きさが)あります。
When I was there, I interviewed some spectators about the festival.
(Interview inserted here)
そこにいた時、私はエイサー祭りについて、かんきゃくにインタビューしました:
I think overall you are doing very well, just you may want to pay more attention to particles (が、に、etc.)