Absolutely! Research and helping to plan events are both things I do in my practice on a regular basis. Often these are very time consuming duties for a business owner so it's perfect for a VA (since we are all great on the computer, know where to find specific information and organized!). I would definitely add these to the services you offer. Alot of times business owners don't even realize how much of their time is taken up doing this type of work and if they see that you can do it, they'll realize they need your help that much more!
