There are lots of cosplay events both big and small which are held almost every week in Japan, so we Japanese see people dressed up in costumes on a regular basis.
この場合、次のような言い方ができます。
ーThere are lots of cosplay events both big and small which are held almost every week in Japan, so we Japanese see people dressed up in costumes on a regular basis.
「大小のさまざまなコスプレイベンがあり、日本ではほぼ毎週開催されているので、私たち日本人は日常的にコスプレイヤーを見かけます」
There are lots of cosplay events both big and small で「大小のさまざまなコスプレイベンがある」と言えます。
on a regular basis「日常的に」
ご参考まで！
カナダ 
