The word "conference" can sound intimidating. At first, they might seem like they are. Stepping into a room full of experts may seem daunting, but conferences are actually one of the more approachable parts of science culture. They’re also absolutely not off-limits to students.
A scientific conference is a gathering where researchers present new findings, get feedback from peers, and network. The size of a conference can vary heavily. Some of them are small and specific to one narrow subfield, sometimes enormous, spanning an entire discipline with thousands of attendees. They usually include a mix of oral presentations, poster sessions, keynote speakers giving bigger-picture addresses, and informal networking events where a surprising amount of real scientific collaboration actually gets started over coffee.
Poster sessions are the part most relevant to you. Researchers, including plenty of high schoolers and undergrads, stand next to a large printed poster summarizing their project and talk through it one-on-one or in small groups with anyone who stops by. It's one of the best low-stakes ways to practice explaining your work out loud, since you get to have the same conversation dozens of times with different people and get a little more polished each time.
Conferences look a little different depending on the field, too. In many computer science subfields, conference proceedings are actually considered the primary, most prestigious way to publish research unlike biology or chemistry, where journal articles usually hold that top spot and conferences are more about presenting work in progress. It's also increasingly common for conferences to offer a virtual or hybrid attendance option, which has made them more accessible to students who couldn't otherwise afford travel and registration costs.
If your program mentions a "poster session" at the end of the summer, that just means there’s an opportunity to practice science communication in a room full of people who actually want to hear about your work, many of whom will ask genuinely curious questions rather than trying to stump you.
You also don't need your own project to get value out of a conference. Plenty of students attend purely as observers, sitting in on talks in a field they're curious about and wandering poster sessions to see what a finished project actually looks like before they've started one of their own. Some universities and professional societies offer free or discounted student registration specifically to encourage this. And beyond the general research-society conferences your mentor might attend, some regional and national student research conferences accept independent submissions, so it's worth asking a mentor whether your project might be a fit for one, even outside of a formal program.
If the idea of standing beside a poster and explaining your work to strangers sounds nerve-wracking, that's completely normal! It does, however, get much easier after the first few talks. As the day progresses, you’ll start to enjoy speaking with every visitor!