These events typically require advance registration, often an online prepayment by credit card. However, they may accept a few walk-ins when needed to balance the gender ratio. Some services make use of wait lists when signing up to strive for exactly the same number of men and women, while others have a more "party" atmosphere and only aim for an approximately matching number.
There are many speed dating events now in the United Kingdom, Canada, and the United States. Many of these simply specify an age range for ladies and gentlemen; sometimes a slightly older range is specified for men. On the other hand, many organizers offer niche events such as nights for graduates only, gays and lesbians, older men with younger women and vice versa, book lovers, ethnic events, and religious affiliation such as Christian speed