A mass butterfly release is where the butterflies are loaded into a box and when the box is opened all the butterflies will be free to fly out, this type of release creates a stunning spectacle. 

An individual butterfly release is where each person has a single envelope containing a butterfly and releases it by tipping it out into their hand. The butterflies are kept cool before the release allowing each person time to experience the butterfly while it warms its wings before flying away.

Prop butterflies are butterflies to use during a photo shoot before or after an event. These butterflies are kept cool so that they are easy to move around and pose while getting pictures eventually these butterflies will warm up enough to fly away.

Other check this box if you have a different idea in mind. Some people use butterflies as a center piece, video production prop, or want a caterpillar or pupa.