Here's a top ten list of those events that I think will happen when we make actual contact with those alien races that have been monitoring our planet.

A large TV scene in front of the spacecraft shows a video of K.D. Lang singing Hallelujah. I always start to cry when I hear this version of Leonard Cohen's song.

1. On the large TV comes the words, "We love your music and art". This is followed by paintings from the masters and great music from Mozart, Beethoven, Chopin, etc. The last presentation is a video of teenagers dancing to "The Fly" by Chubby Checker. "This music makes us feel young again."
2. Words appear on the TV screen again, "We like your science fiction, especially Star Trek and Star Wars. Our favourite characters are "Spock" and "Data". We don't like "Q". We like "Alex Guinness" who played "Obi-Wan-Kenobi" in the first Star Wars. He was a great actor.
3. On the TV screen, the pictures of Rod Serling, Gene Roddenberry, George Lucas, Richard Matheson appear followed by these words, "Earth's great prophets of the last century were mainly science fiction writers". We particularly like Mr. Serling's unique view of the afterlife in Twilight Zone episodes like "A Game of Pool" and "Nice Place To Visit".
4. On the screen: "Our manual on "How To Serve Man" isn't a cookbook". The TV screen continues with images relating to words below.
5. "All religious texts on Earth have much truth and wisdom in them. This includes Sumerian writings and India's Vedas".
6. "Comedy on Earth is very original and creative. The majority of us like Jackie Gleason, Mel Brooks, Carol Burnett and George Burns. We particularly liked George Burns playing God in "Oh God"."
7. "Earth is one of the most beautiful planets in the Galaxy. We love your magnificent mountains, your placid lakes, your lush forests teeming with varied life forms. We love to meditate beside still waters and exquisite scenery."
8. There is a pause for one minute and a video with regards to"Disclosure" is shown. "We have come to tell you what we know about contact between our members, individuals, and governments.
9. The door of the spaceship opens and aliens of every kind and description come forward. They move to both sides of the ship to make way for their leader, a tall blond man, who looks like John Kennedy. He speaks passionately, "A great civilization is not one that has great weapons, fast spaceships or high technology. It is one that cares for every one of its citizens. It is one that believes in "Rule of Law" for everyone and equality of sentient beings". 
10. "For criminal acts against humanity and violations of Galactic law, various Grays, Reptilians,Pleiadians,Procyons, Mantoids are being held in detention pending trial on your planet. Please bring the prisoners forward." They are lead away in electronic handcuffs and ankle cuffs. "We of the Galaxy Federation welcome Earth to our organization. Live, long and prosper."