Looking for events and things to do in San Marcos? A lively college town between Austin and San Antonio, San Marcos centers its events on the river, the university, and its historic square. This local guide covers San Marcos’s biggest annual festivals, recurring markets and events, seasonal highlights, and how to find out what’s happening this weekend — straight from the people who live here.

San Marcos’s biggest annual events & festivals

San Marcos’ signature events include the Mermaid Society SMTX festival (celebrating the San Marcos River and mermaid folklore), the Sights & Sounds of Christmas, the Texas State University homecoming and events, the Summer in the Park concert series, and river-season celebrations.

Farmers markets & recurring things to do in San Marcos

The San Marcos farmers market runs in season, and the historic Downtown Square and the San Marcos River host regular concerts, festivals, and events, with a lively bar-and-music scene around Texas State University.

San Marcos through the seasons

Summer revolves around the spring-fed river — tubing, Summer in the Park concerts, and festivals; fall brings Texas State homecoming and events; and winter features the beloved Sights & Sounds of Christmas at the park.

What to know about San Marcos events

The Downtown Square and the river are the event hubs, both walkable. Texas State drives much of the calendar. It’s an easy trip to Austin and San Antonio, but the river and square events are the local draw.

What’s happening in San Marcos this weekend

Printed event calendars go stale fast, and the best local happenings — pop-ups, block parties, last-minute shows — often never make the official listings. The most current, honest answer to “what’s going on this weekend?” comes from neighbors. On Neighborhood Nurturers’ San Marcos community, real San Marcos residents post and discuss what’s happening right now. For more ideas any time, see our guide to the best things to do in San Marcos. Join your San Marcos neighbors free and never miss what’s happening →

Fitting it into a day in San Marcos

The best events here are seasonal and neighborhood-driven, so timing is everything. What sets San Marcos apart is how close everything sits together. Start near the San Marcos River, work in one of the spots from this guide, and you are minutes from Rio Vista Falls if you want to keep going. Locals often round out the local calendar with a detour to Purgatory Creek Natural Area or a quieter stop at the Texas State campus. Because the distances are short, you can improvise as you go rather than lock the whole day down in advance.

More San Marcos guides

San Marcos rewards people who dig a little deeper. These related guides map the same neighborhoods from different starting points: Things to do in San Marcos, Free things to do in San Marcos, Things to do with kids in San Marcos — enough to plan a whole day or two.

Get a local’s take

Guides are a starting point; the current, on-the-ground details come from people who live in San Marcos. Hours shift, favorites change, and residents always know what is genuinely worth it now. Ask San Marcos neighbors directly or join your town community free to hear from real locals.

San Marcos is the Mermaid Capital of Texas

That is not a joke and it is not informal — it is the civic identity this town has adopted, and it runs through its event calendar.

The origin is the water. Spring Lake is so clear that it supported decades of underwater performance and glass-bottom boat tourism, and the mermaid became the symbol of a town defined by springs.

Mermaid SPLASH takes place every September, celebrating local art, heritage and the city’s water culture, with merfolk taking over San Marcos for the occasion.

⚠️ The Mermaid Capital of Texas Fest — the larger festival with the Mermaid Parade and Downtown Faire — is cancelled for 2026. If you have read about it elsewhere, check the current position before planning around it. This is exactly why we do not publish event dates.

The Texas Water Safari

The most extraordinary thing on this calendar, and it starts here.

The Texas Water Safari is billed as the “World’s Toughest Canoe Race” — a 260-mile canoe and kayak race running from Spring Lake in San Marcos to Seadrift on the Texas coast.

Competitors set off from the springs — the same water that keeps the river at 72 degrees — and paddle to the Gulf. There are no motors and no outside assistance beyond designated points. It is a genuinely brutal event, and watching the start at Spring Lake is free and worth doing.

It is also a neat summary of this town: the race begins at the point where an aquifer serving two million Texans reaches daylight, at a site people have lived beside for around 11,500 years.

Sights & Sounds of Christmas

The biggest civic event of the year, and the one residents organise December around.

Sights & Sounds of Christmas runs across six evenings in December, along the San Marcos River. It includes carnival rides, arts and crafts, pictures with Santa, local school performances, a live nativity scene, a food court and extensive lighting.

The riverside setting is what makes it distinctive rather than generic — a Christmas festival strung along a spring-fed river in a mild Texas December is a genuinely pleasant thing, and it draws from across the region.

Confirm the current year’s dates directly. They move.

The academic calendar is an event calendar

Worth stating plainly, because it governs the rhythm of this town more than any festival.

Texas State University move-in, term start, homecoming, finals and graduation all reshape traffic, restaurant hours, bar crowds and accommodation availability in San Marcos.

If you are visiting, check the university calendar as well as the events calendar. A weekend that coincides with move-in or graduation is a different town — busier, fuller, and with hotels booked out.

The rhythm of the San Marcos year

Spring — the best weather, and the run-up to the river season.

Early summer — the Texas Water Safari sets off from Spring Lake, and the river season peaks.

September — Mermaid SPLASH, and the most comfortable outdoor month of the second half of the year.

December — Sights & Sounds of Christmas along the river, six evenings, and the town at its most communal.

Term time versus summer break runs underneath all of it, changing hours and crowds throughout.

Why this page does not list dates

Because they move, and because — as the 2026 cancellation of the Mermaid Capital of Texas Fest shows — events in a town this size can disappear for a year at a time.

What is durable is the shape: a mermaid identity rooted in the springs, a 260-mile canoe race starting at Spring Lake, six December evenings along the river, and a university calendar underneath everything. For the dates, go to the city and the organisers — or to the neighbors already going.

How to find what is actually on

The City of San Marcos and the visitor bureau publish the civic calendar — festivals, Sights & Sounds, and public programming.

The Texas Water Safari organisers publish the race date and route.

Texas State University publishes the academic calendar, which matters as much as the events calendar for planning a visit.

Downtown and the square run their own smaller programming through the year.

The community feed for everything else, which in a town this size is most of it.

And confirm before travelling. The 2026 cancellation of the Mermaid Capital of Texas Fest is a useful reminder that in a town of this size, a festival appearing on last year’s listings may simply not be happening.

One last observation: San Marcos builds its calendar around its water. A canoe race that starts at the springs, a mermaid festival rooted in the clarity of the lake, and a Christmas festival strung along the riverbank. For a town whose entire existence depends on 200 springs, that is a coherent and rather charming way to organise a year.

Confirm every date before you travel. That is the whole practical instruction for events in a town this size.

For residents rather than visitors, the most useful habit is simply following the city and the university calendars together. Between them they explain almost every busy weekend in San Marcos.

And if you can only visit once, come in late September. Mermaid SPLASH is on, the heat has broken, and the river is exactly the same temperature it is in July.

Frequently asked questions

What are the biggest events in San Marcos, Texas?

The Mermaid Society SMTX festival, the Sights & Sounds of Christmas, Texas State University events, and the Summer in the Park concert series.

Does San Marcos have a farmers market?

Yes — the San Marcos farmers market runs in season, alongside Downtown Square and riverside events.

What’s happening in San Marcos this weekend?

San Marcos neighbors share the most current local events — from river-season happenings to square festivals and campus events — in our community.