So; I take it you'd not be scared to go to a pub you've not been to before, where you may see people you've not met previously, in case something happened, but you are fearful of going to a circle where, at most, you may experience those who have died but still seem able to communicate ? That seems a little inconsistent to me. Why would one fear the latter more than the former ?
If you are not keen then no one is forcing you, but why miss out on a possible experience ? One doesn't learn anything unless one investigates, otherwise the route taken is the way to simple blind faith, either for, or against. Besides I suspect the first one you attend is likely to be less than overwhelming anyway. If curiosity is piqued then you'd really need to go to quite a few; experience the times when communication seems good as well as those when it is a bit disappointing.
But my advice, if you want to take it slowly, is to try a few months of Sunday's at the local spiritualist church. It'll cost you no more than a voluntary weekly donation for the collection plate. Again not every visit will be miraculous, but you should find a few make you think, especially if the medium comes to you during that part of the service. If they do, remember, don't feed the medium; they are telling you, you are not there to blurt out things for them to agree to.