Strange Loop

Sept 30 - Oct 2, 2021


Union Station


St. Louis, MO


Registration Info


Registration Tips

The registration site we are using follows the order flow below:

Rates and Dates Overview

Strange Loop will be held Sept 30 - Oct 2, 2021. Thursday Sep 30th is an optional preconference day for long-form workshops at an additional cost to the main conference. The TLA+ pre-workshop is the only event that will be held on Wednesday Sep 29th.

This is an in-person event. Please read the COVID FAQ for questions and guidance, all subject to change in the coming months.

Item Dates Cost
Regular Rate (until Sep 2) Oct 1-2 $700
Group Rate (minimum of 6) Oct 1-2 $625
Self-paid discount rate Oct 1-2 $500
Student Rate - send student ID Oct 1-2 $450
Late Rate (after Sep 2) Oct 1-2 $850
Preconf - 2.5 hr workshops Sep 30 $225 each
TLA+ Conf - all day Sep 30 $200
TLA+ Pre-workshop Sep 29 $200

Virtual attendance

For the first time, Strange Loop 2021 will also allow virtual attendance via live streaming. Please see the virtual attendee page for more information on registration and details.

Hotel Accommodations

Information on the main and overflow hotel is included below. While you may use any hotel in the area, we will only provide shuttle service from Union Station and Hilton Ballpark to events such as the conference party. If you're at a nearby hotel, please feel free to use the shuttles too!

Main hotel: Union Station Hotel

Note that as all staff and speakers are staying at Union Station, there are a limited number of rooms available.

Overflow hotel: Hilton St. Louis at the Ballpark

Other options

Generally any hotel search site can be used to find nearby hotels in downtown St. Louis at comparable rates. If you are flying in, it's easiest to find a hotel close to the St. Louis Metrolink light rail, which runs from the airport to downtown St. Louis and has stops near the conference venues.

Other hotels in close walking distance include include: Drury Inn, Pear Tree Inn, Courtyard by Marriott Downtown West, and the St. Louis City Center Hotel.


The conference will be held at the historic Union Station. Union Station was once one of the largest railroad stations in the world, and is now a hotel and conference space, with destination amenities like an aquarium, Ferris wheel, and restaurants.