Mardi Gras-a carnival held in some countries on Shrove Tuesday (the last day before Lent) but especially in New Orleans.
Bottleneck effect is when there's something that either kills the majority of the population or just prevents it from reproducing. This creates genetic drift because the likelihood of gene prominence changing is much higher in a small population. The Founder Effect is a type of Bottleneck effect. It is when a small amount of individuals starts a population usually due to migration.
Another phenomena, the bottleneck effect is related to the founder effect and occurs when only a small portion of the original population survives to serve as the sole source of the population. This can be attributed to two phenomena, the clustering effect across time and the founder effect.