Missionary work to India?

I am a nigerian evangelist about to come to India to blow trumpet and play music in Indian churches, please how can I get a good christian that can help me to secure an invitation letter that is business, so that I can get a visa without prejudice. Who cares to help. I hate to be blacklisted in the emby for the christian and charitable commitment I am going to India for. thanks, who cares to help?