If I were speaking to good native speakers, especially older people in Conamara, I would prefer to word them like this:-

1. Have you anything planned ? / A' bhfuil tada leagtha amach 'ad le déanamh ?

Nó

1a. A' bhfuil tada leagtha amach 'ad ?

2. Have you anything planned for the weekend ? / A' bhfuil tada leagtha amach 'ad le déanamh ar an deireadh seachtmhaine ?
Nó

2A. Have you anything planned for the weekend ? / A' bhfuil tada leagtha amach 'ad ar an
deireadh seachtmhaine le déanamh ?

3. I've nothing planned / Ní'l tada leagtha amach 'am.

Pronounce the word 'leagtha' as leagthaí nó lackey.

I'm presuming that most people will know that I'm using the older spellings here, and the Conamara way of prounouncing them, but feel free to modify/ change if you wish.