The venue may have its own AV equipment, or its own AV staff. It may have a preferred supplier that you have to use, or even a list of them that you can choose from.
If the venue has its own equipment, you will need to check that it is to the standard you require for the purpose intended.
Whether you have a choice of AV supplier or not, you should provide them with a brief that details your requirements, the number of guests and your objectives for the event. You will also need to give them an idea of your budget.
Some buildings within the University or Colleges are very old, and care must be taken when using AV equipment. Keep in contact with the venue regarding your AV arrangements. Some equipment may not be allowed in certain venues. You may not be able to hang equipment, or use adhesive to stick items to walls and ceilings.