Holidates are most appropriate (although this is not essential) when in a long distance relationship. The only real prerequisite is that neither partner lives in the holiday destination, giving an equal playing field to explore the new town together and get to know each other better without the preconception of one person playing host.
Althogh its typically an unspoken rule that there is the expectation of sex, the comparitively innocent holidate is not to be confused with the dirty weekend, which usually sees the couple staying in the hotel room for the entirety of the weekend.
Jenny and I are going on a holidate down south for the long weekend.
Guy2 "Yeah, don't get your hopes up man"
Guy1"Don't have to, we're totally holidating, it's the best i could do!
Guy2 "Wow, who cares, a Holidate is good enough!"