If you want to give a fun unique gift to impress the geek in your life you can never go wrong with a pass to any number of conventions in the USA. Depending on rather it’s a local convention that is all about Anime, Doctor Who, Supernatural, Steampunk or (the original) Comic Books you can find one that a fan will be delighted to attend. Now I do not recommend promising a high profile ticket (for example) San Diego Comic Con (unless you want to try for 2017) but you should have no problem grabbing passes for the following (once they go on sale):
These are a few that I personally attend are on my list to checkout with a variety of prices and don’t forget if it’s out of town make a hotel reservation early so that your close to all the action. As you can see some are regional and others are one themed but they are all a blast where you can be yourself either dressing in cosplay or wearing a beloved tshirt with people who ‘know’ or just finally getting to meet the cast and crew of beloved tv/movies surrounded by other fans.