It is the RSGB 144/432 MHz March Contest (1400-1400) on 1st-2nd March
Whilst you are unlikely to suffer the same sort of QRM from this that you find in major HF contests it will perhaps be busier on the VHF bands than most other weekends. (He says hopefully - as I should be out as G0LGS/P for some of the 24 hours).
The Rules for these RSGB VHF contests have been revised a little since last year (General Rule 4f is the one that covers multiple contacts if anyone is interested).
If you happen to operate from more than one Hill during this event and you try calling any station entering the contest more than once on each band you may politely (I would hope) be told ‘we have already worked’.
I’ll be happy to work any of you just for the extra few Chaser points (I’ll try to keep my own mental record of any /P Summit stations to avoid duplicate contacts in my contest log, but the logging software will catch them for me anyway). It helps if you have the IARU Locator square handy but I can manage with just the SOTA reference.