diff --git a/.gitignore b/.gitignore
index da0a2c4..6ed89e9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 /ics
 *.html
 *.ics
+/tmp/
diff --git a/go.mod b/go.mod
index 9763513..3d89765 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,6 @@ module github.com/cbix/ics
 go 1.21.6
 
 require (
-	github.com/arran4/golang-ical v0.2.3 // indirect
-	github.com/coreos/go-systemd/v22 v22.5.0 // indirect
+	github.com/arran4/golang-ical v0.2.3
+	github.com/coreos/go-systemd/v22 v22.5.0
 )
diff --git a/go.sum b/go.sum
index 0dd9286..de3e61e 100644
--- a/go.sum
+++ b/go.sum
@@ -4,16 +4,20 @@ github.com/coreos/go-systemd/v22 v22.5.0 h1:RrqgGjYQKalulkV8NGVIfkXQf6YYmOyiJKk8
 github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0 h1:hjy8E9ON/egN1tAYqKb61G10WtihqetD4sz2H+8nIeA=
 gopkg.in/yaml.v3 v3.0.0/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/theateraachen.go b/theateraachen.go
new file mode 100644
index 0000000..cd8370a
--- /dev/null
+++ b/theateraachen.go
@@ -0,0 +1,119 @@
+package main
+
+import (
+	"bufio"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/arran4/golang-ical"
+)
+
+func init() {
+	RegisterAdapter("theateraachen", theateraachenUrl, "Theatre in Aachen (beta)", theateraachenAdapter)
+}
+
+type theateraachenData struct {
+	Ecommerce theateraachenEcommerce `json:"ecommerce"`
+}
+
+type theateraachenEcommerce struct {
+	Impressions []theateraachenImpression `json:"impressions"`
+}
+
+type theateraachenImpression struct {
+	Id       string               `json:"id"`
+	Name     string               `json:"name"`
+	Variant  theateraachenVariant `json:"variant"`
+	Position int                  `json:"position"`
+}
+
+type theateraachenVariant struct {
+	DateTime  string `json:"dateTime"`
+	VenueName string `json:"venueName"`
+	GenreName string `json:"genreName"`
+}
+
+func (i theateraachenImpression) StartTime() time.Time {
+	t, _ := time.ParseInLocation(theateraachenLocalFormat, i.Variant.DateTime, theateraachenTZ)
+	return t
+}
+
+func (i theateraachenImpression) EndTime() time.Time {
+	return i.StartTime().Add(2 * time.Hour)
+}
+
+const (
+	theateraachenUrl         = "https://www.theateraachen.de/"
+	theateraachenSrc         = "https://theateraachen.reservix.de/events/%d"
+	theateraachenJsonPrefix  = "var impressionData = "
+	theateraachenLocalFormat = "2006-01-02 15:04:05"
+)
+
+var theateraachenTZ, _ = time.LoadLocation("Europe/Berlin")
+
+func theateraachenAdapter(w io.Writer) error {
+	cal := ics.NewCalendarFor("github.com/cbix/ics")
+	cal.SetName("Theater Aachen")
+	cal.SetColor("#f0ff3c")
+	cal.SetUrl(theateraachenUrl)
+	cal.SetTimezoneId("Europe/Berlin")
+	now := time.Now()
+	pos := 0
+page:
+	for i := 1; i < 10; i++ {
+		req, err := http.NewRequest("GET", fmt.Sprintf(theateraachenSrc, i), nil)
+		if err != nil {
+			return err
+		}
+		req.Header.Set("User-Agent", "Mozilla/5.0 Gecko/20100101 Firefox/122.0")
+		res, err := http.DefaultClient.Do(req)
+		if err != nil {
+			return err
+		}
+		if res.StatusCode != http.StatusOK {
+			return errors.New(fmt.Sprintf("received status %s", res.Status))
+		}
+		scanner := bufio.NewScanner(res.Body)
+		var jsonData []byte
+		found := false
+		for scanner.Scan() {
+			l := strings.Trim(scanner.Text(), " ;")
+			if strings.HasPrefix(l, theateraachenJsonPrefix) {
+				jsonData = []byte(strings.TrimPrefix(l, theateraachenJsonPrefix))
+				found = true
+				break
+			}
+		}
+		if !found {
+			return errors.New("Expected JSON data not found")
+		}
+		var data theateraachenData
+		err = json.Unmarshal(jsonData, &data)
+		if err != nil {
+			return err
+		}
+		if len(data.Ecommerce.Impressions) == 0 {
+			break
+		}
+		for _, ev := range data.Ecommerce.Impressions {
+			p := ev.Position
+			if p <= pos {
+				break page
+			}
+			pos = p
+			event := cal.AddEvent(fmt.Sprintf("%s@theateraachen.reservix.de", ev.Id))
+			event.SetDtStampTime(now)
+			event.SetSummary(ev.Name)
+			event.SetDescription(ev.Variant.GenreName)
+			event.SetLocation(ev.Variant.VenueName)
+			event.SetStartAt(ev.StartTime())
+			event.SetEndAt(ev.EndTime())
+		}
+	}
+	return cal.SerializeTo(w)
+}