The short answer is, yes!
You can use laptops, keyboards and any other electronic equipment that you bring.
However, please be aware that as performers generally get two songs (about 8-10 mins) this also includes time to set up your gear.
So if your gear takes you 5 mins to set up, you may only have time to perform 3-5 mins of material.
The best thing is to set your gear up first (before you're called up to perform) so you know everything is working and ready to go, then when it's your turn take it all to the performance area, plug it back in and you're ready to go with the least delay possible.