Hi and welcome :). I usually take all my music with me depending on the age group I’m playing for. If its teens I tend to “mix as I go” , but about the changing of BPM. I agree with youngez. If there’s someone playing prog house after you then try ending with a higher BPM. I usually ask the guy/girl that’s playing after me what the BPM of their starting song is so I know I have to end with a BPM close to that. (Its just my way of doing it).