1. "Now my colleagues will in more detail tell about our idea"
Надо сказать так: Now my colleagues will be told more detailed about our idea.
2. В остальном — всё правильно, но пропущены 2 запятые.
Для наглядности я подчеркнул 2 слова, между которыми должна быть запятая.
Therefore, our research group suggests to make Leninsk-Kuznetsky
the tourist city. We want to make our city the focus of celebration of
Russian folk festivals, such as Maslenitsa, Easter, Ivan Kupala, and
others. We think that such tourism will draw many foreigners . Now my
colleagues will in more detail tell about our idea..... We hope that you
will appreciate our idea and provide a grant for implementation of this