Hello Emma, well done for asking the question in BSL! A useful resource for finding BSL signs is YouGlish - you can search for lots of different languages though, so make sure your settings are for BSL. It has over 100 examples of the sign "festival":
https://youglish.com/pronounce/festival/signlanguage/uk?
The sign for "festival" can be seen here at 0:07:
Tip for YouTube - if you go to the settings on the bottom right, you can slow it right down so you can catch all the signs.
And if I can offer a bit of feedback on your signing - the letter "S" is signed with both your little fingers - no index finger involved! (A common mistake but good to catch early!)
All the best.
